2023
Karen Wadenpfuhl
Emergence of synchronisation in a driven-dissipative hot Rydberg vapour Masters Thesis
2023.
@mastersthesis{nokey,
title = {Emergence of synchronisation in a driven-dissipative hot Rydberg vapour},
author = {Karen Wadenpfuhl},
url = {https://www.physi.uni-heidelberg.de/Publications/MThesis_KarenWadenpfuhl.pdf},
year = {2023},
date = {2023-09-15},
urldate = {2023-09-15},
keywords = {},
pubstate = {published},
tppubtype = {mastersthesis}
}
K. Welz, M. Gerken, B. Zhu, E. Lippi, M. Rautenberg, L. Chomaz, M. Weidemüller
Anomalous loss behavior in a single-component Fermi gas close to a p-wave Feshbach resonance Journal Article
In: Phys. Rev. A, vol. 107, iss. 5, pp. 053310, 2023.
@article{PhysRevA.107.053310,
title = {Anomalous loss behavior in a single-component Fermi gas close to a p-wave Feshbach resonance},
author = {K. Welz and M. Gerken and B. Zhu and E. Lippi and M. Rautenberg and L. Chomaz and M. Weidemüller},
url = {https://link.aps.org/doi/10.1103/PhysRevA.107.053310},
doi = {10.1103/PhysRevA.107.053310},
year = {2023},
date = {2023-05-01},
urldate = {2023-05-01},
journal = {Phys. Rev. A},
volume = {107},
issue = {5},
pages = {053310},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2022
Binh Tran
From Efimov Physics to Polarons in an Ultracold Mixture of Li and Cs Atoms PhD Thesis
2022.
@phdthesis{nokey,
title = {From Efimov Physics to Polarons in an Ultracold Mixture of Li and Cs Atoms},
author = {Binh Tran},
url = {https://archiv.ub.uni-heidelberg.de/volltextserver/31882/, heiDOK},
year = {2022},
date = {2022-06-30},
abstract = {This thesis reports on the reconstruction and improvement of a quantum gas experiment for studying Bose polarons as well as on theoretical investigations at the interface between Efimov physics and Fermi polarons. In both experiment and theory an ultracold mixture of fermionic 6Li and bosonic 133Cs with a large mass ratio is considered. With the improved experimental setup we realize Bose-Einstein condensates (BEC) of 133Cs with N = 10^4 atoms and molecular BECs of 6Li2 with N = 10^5 dimers. For the creation of Bose polarons we trap a small number of Li atoms in a tightly confined optical dipole trap and propose a scheme to combine them with the 133Cs BEC. In a theoretical study, employing the Born-Oppenheimer approximation, we calculate Efimov bound state energies (E < 0) in a three body Cs-Cs-Li system and in a many-body environment where two 133Cs atoms are immersed in a Fermi sea of 6Li atoms. In these systems the intraspecies scattering length determine the ground state and the Fermi sea leads to a modification of the binding energies. For the scattering states (E > 0) we calculate the induced scattering length between two 133Cs atoms mediated by the Fermi sea, and find resonant behavior. We find that for large mass ratios bound states can persist at positive energies to form quasibound states.},
keywords = {},
pubstate = {published},
tppubtype = {phdthesis}
}
This thesis reports on the reconstruction and improvement of a quantum gas experiment for studying Bose polarons as well as on theoretical investigations at the interface between Efimov physics and Fermi polarons. In both experiment and theory an ultracold mixture of fermionic 6Li and bosonic 133Cs with a large mass ratio is considered. With the improved experimental setup we realize Bose-Einstein condensates (BEC) of 133Cs with N = 10^4 atoms and molecular BECs of 6Li2 with N = 10^5 dimers. For the creation of Bose polarons we trap a small number of Li atoms in a tightly confined optical dipole trap and propose a scheme to combine them with the 133Cs BEC. In a theoretical study, employing the Born-Oppenheimer approximation, we calculate Efimov bound state energies (E < 0) in a three body Cs-Cs-Li system and in a many-body environment where two 133Cs atoms are immersed in a Fermi sea of 6Li atoms. In these systems the intraspecies scattering length determine the ground state and the Fermi sea leads to a modification of the binding energies. For the scattering states (E > 0) we calculate the induced scattering length between two 133Cs atoms mediated by the Fermi sea, and find resonant behavior. We find that for large mass ratios bound states can persist at positive energies to form quasibound states.
Saba Zia Hassan
Dynamics of anions and ultracold atoms in a hybrid atom-ion trap PhD Thesis
2022.
@phdthesis{nokey,
title = {Dynamics of anions and ultracold atoms in a hybrid atom-ion trap},
author = {Saba Zia Hassan},
url = {https://archiv.ub.uni-heidelberg.de/volltextserver/31692/, heiDOK},
year = {2022},
date = {2022-05-24},
urldate = {2022-05-24},
abstract = {In this work, the dynamics of anion-neutral interactions are studied in a hybrid atom-ion trap. An octupole radio-frequency trap is used for trapping anions, and a dark spontaneous-force optical trap is employed to create ultracold rubidium (Rb) atoms. Spatial density distributions of the ion and atom clouds are determined via photodetachment tomography and saturation absorption imaging, respectively. A method to map the ions’ translational temperature onto their time of flight to the detector is presented. This technique is applied to determine the temperature of OH−anions as they undergo laser-induced forced evaporative cooling to temperatures below 4 K. The dynamics of associative electronic detachment reaction between closed-shell anions OH−and alkali atoms are investigated where for a ground-state Rb the influence of a dipole-bound state as a reaction intermediate is observed. The interaction dynamics of Rb with OH−(H2O) are also explored, where a smaller atom-to-ion mass ratio favors sympathetic cooling via elastic collisions. For atomic O−, the detachment processes involving ground-state Rb are found to be closed and efficient anion sympathetic cooling, via ultracold Rb, is observed. These results present hybrid systems as a platform to investigate anion-neutral collision dynamics, particularly interesting for astrochemistry, fundamental physics, and quantum chemistry.},
keywords = {},
pubstate = {published},
tppubtype = {phdthesis}
}
In this work, the dynamics of anion-neutral interactions are studied in a hybrid atom-ion trap. An octupole radio-frequency trap is used for trapping anions, and a dark spontaneous-force optical trap is employed to create ultracold rubidium (Rb) atoms. Spatial density distributions of the ion and atom clouds are determined via photodetachment tomography and saturation absorption imaging, respectively. A method to map the ions’ translational temperature onto their time of flight to the detector is presented. This technique is applied to determine the temperature of OH−anions as they undergo laser-induced forced evaporative cooling to temperatures below 4 K. The dynamics of associative electronic detachment reaction between closed-shell anions OH−and alkali atoms are investigated where for a ground-state Rb the influence of a dipole-bound state as a reaction intermediate is observed. The interaction dynamics of Rb with OH−(H2O) are also explored, where a smaller atom-to-ion mass ratio favors sympathetic cooling via elastic collisions. For atomic O−, the detachment processes involving ground-state Rb are found to be closed and efficient anion sympathetic cooling, via ultracold Rb, is observed. These results present hybrid systems as a platform to investigate anion-neutral collision dynamics, particularly interesting for astrochemistry, fundamental physics, and quantum chemistry.
Manuel Gerken
Exploring p-wave Feshbach Resonances in Ultracold Lithium and Lithium-Cesium Mixtures PhD Thesis
2022.
@phdthesis{nokey,
title = {Exploring p-wave Feshbach Resonances in Ultracold Lithium and Lithium-Cesium Mixtures},
author = {Manuel Gerken},
url = {https://archiv.ub.uni-heidelberg.de/volltextserver/31719/, heiDOK},
year = {2022},
date = {2022-05-18},
abstract = {This thesis reports on the exploration of p-wave Feshbach resonances in ultracold Li-6 and Li-6-Cs-133 gases where the pair rotation angular momentum is l=1. An improved experimental apparatus is presented, allowing atom loss spectroscopy with a magnetic field resolutions down to several milli-Gauss on three Li-6, and five Li-6-Cs-133 Feshbach resonances. A doublet structure is observed for the first time on three Li-6 p-wave Feshbach resonances. We assign the splittings to spin-spin interactions where the projection of the pair rotation angular momentum m_l splits the resonance into m_l=0 and |m_l|=1. For the first time we report on observation of spin-rotation interaction on three Li-6-Cs-133 p-wave Feshbach resonances. Here the pair-rotation couples to the atomic spins, leading to an additional splitting of the m_l=-1 and m_l=+1 projections. Via coupled channel calculations we determine the dimensionless spin rotation constant to be |gamma|=0.566(50)x10^(-3). With a simple model we show that the strength of spin-rotation coupling depends significantly on the short-range part of the electron wave functions, highlighting the potential of Feshbach resonances to provide precise information on electron and nuclear wave functions at short internuclear distance. In an additional exploratory study of losses close to a single component Fermi pwave, Feshbach resonance we find changes in qualitative loss behavior depending on the density and temperature of the gas. We separate two regimes depending on the dominance of either elastic or inelastic collisions showing three- or two-body loss behavior, respectively. Collisional losses with possible cooling efficiencies similar to classic evaporative cooling are predicted.},
keywords = {},
pubstate = {published},
tppubtype = {phdthesis}
}
This thesis reports on the exploration of p-wave Feshbach resonances in ultracold Li-6 and Li-6-Cs-133 gases where the pair rotation angular momentum is l=1. An improved experimental apparatus is presented, allowing atom loss spectroscopy with a magnetic field resolutions down to several milli-Gauss on three Li-6, and five Li-6-Cs-133 Feshbach resonances. A doublet structure is observed for the first time on three Li-6 p-wave Feshbach resonances. We assign the splittings to spin-spin interactions where the projection of the pair rotation angular momentum m_l splits the resonance into m_l=0 and |m_l|=1. For the first time we report on observation of spin-rotation interaction on three Li-6-Cs-133 p-wave Feshbach resonances. Here the pair-rotation couples to the atomic spins, leading to an additional splitting of the m_l=-1 and m_l=+1 projections. Via coupled channel calculations we determine the dimensionless spin rotation constant to be |gamma|=0.566(50)x10^(-3). With a simple model we show that the strength of spin-rotation coupling depends significantly on the short-range part of the electron wave functions, highlighting the potential of Feshbach resonances to provide precise information on electron and nuclear wave functions at short internuclear distance. In an additional exploratory study of losses close to a single component Fermi pwave, Feshbach resonance we find changes in qualitative loss behavior depending on the density and temperature of the gas. We separate two regimes depending on the dominance of either elastic or inelastic collisions showing three- or two-body loss behavior, respectively. Collisional losses with possible cooling efficiencies similar to classic evaporative cooling are predicted.
Renato Ferracini Alves
Realization of a Heisenberg XXZ spin system using Rydberg atoms PhD Thesis
2022.
@phdthesis{,
title = {Realization of a Heisenberg XXZ spin system using Rydberg atoms},
author = {Renato Ferracini Alves },
url = {https://archiv.ub.uni-heidelberg.de/volltextserver/31511/, heiDOK},
year = {2022},
date = {2022-02-02},
urldate = {2022-02-02},
abstract = {In this thesis, we present the realization of an isolated Heisenberg XXZ spin 1/2 system with an off-diagonal disorder in the coupling constants using cold atoms in highly excited Rydberg states. We select a set of Rydberg states that interact via van der Waals interaction which can be mapped onto an interacting spin system. We investigate the out-of-equilibrium dynamics of the spin system after it has been initialized in a fully magnetized state. Following unitary evolution governed by the Heisenberg spin Hamiltonian, we measure the magnetization as a function of the evolution time. By fitting a stretched exponential function to the resulting magnetization dynamics be obtain a stretched exponent of β = 0.32 revealing a slow relaxation of the spin system, similar to what is found in spin glasses. By choice, the initial state is an eigenstate of the mean-field Hamiltonian and thus the observed relaxation indicates that the dynamics are triggered by quantum fluctuations. We find that varying the distribution of coupling constants by means of the so-called dipole blockade effect has no impact on the stretching exponent indicating that it is a universal parameter of the system independent of the microscopic details for the range of disorder explored in the experiment. It also allows us to combine the different datasets by re-scaling the time domain with the characteristic interaction strength. The combined datasets expand our measurements to two orders of magnitude in the re-scaled time-domain showing that slow dynamics is a persistent effect for long evolution times.},
keywords = {},
pubstate = {published},
tppubtype = {phdthesis}
}
In this thesis, we present the realization of an isolated Heisenberg XXZ spin 1/2 system with an off-diagonal disorder in the coupling constants using cold atoms in highly excited Rydberg states. We select a set of Rydberg states that interact via van der Waals interaction which can be mapped onto an interacting spin system. We investigate the out-of-equilibrium dynamics of the spin system after it has been initialized in a fully magnetized state. Following unitary evolution governed by the Heisenberg spin Hamiltonian, we measure the magnetization as a function of the evolution time. By fitting a stretched exponential function to the resulting magnetization dynamics be obtain a stretched exponent of β = 0.32 revealing a slow relaxation of the spin system, similar to what is found in spin glasses. By choice, the initial state is an eigenstate of the mean-field Hamiltonian and thus the observed relaxation indicates that the dynamics are triggered by quantum fluctuations. We find that varying the distribution of coupling constants by means of the so-called dipole blockade effect has no impact on the stretching exponent indicating that it is a universal parameter of the system independent of the microscopic details for the range of disorder explored in the experiment. It also allows us to combine the different datasets by re-scaling the time domain with the characteristic interaction strength. The combined datasets expand our measurements to two orders of magnitude in the re-scaled time-domain showing that slow dynamics is a persistent effect for long evolution times.
V. Bharti, S. Sugawa, M. Mizoguchi, M. Kunimi, Y. Zhang, S. de Léséleuc, T. Tomita, T. Franz, M. Weidemüller, K. Ohmori
Ultrafast Many-Body Dynamics in an Ultracold Rydberg-Excited Atomic Mott Insulator Working paper
arXiv e-prints: 2201.09590, 2022.
@workingpaper{barthi2022,
title = {Ultrafast Many-Body Dynamics in an Ultracold Rydberg-Excited Atomic Mott Insulator},
author = {V. Bharti and S. Sugawa and M. Mizoguchi and M. Kunimi and Y. Zhang and S. de Léséleuc and T. Tomita and T. Franz and M. Weidemüller and K. Ohmori},
url = {https://arxiv.org/abs/2201.09590},
doi = {10.48550/arXiv.2201.09590},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {arXiv},
abstract = {We report the observation and control of ultrafast non-equilibrium many-body electron dynamics in Rydberg-excited spatially-ordered ultracold atoms created from a three-dimensional unity-filling atomic Mott insulator. By implementing time-domain Ramsey interferometry with attosecond precision in our Rydberg atomic system, we observe picosecond-scale ultrafast many-body dynamics that is essentially governed by the emergence and evolution of many-body correlations between long-range interacting atoms in an optical lattice. We analyze our observations with different theoretical approaches and find that quantum fluctuations have to be included beyond semi-classical descriptions to describe the observed dynamics. Our Rydberg lattice platform combined with an ultrafast approach, which is robust against environmental noises, opens the door for simulating strongly-correlated electron dynamics by long-range van der Waals interaction and resonant dipole-dipole interaction to the charge-overlapping regime in synthetic ultracold atomic crystals.},
howpublished = {arXiv e-prints: 2201.09590},
keywords = {},
pubstate = {published},
tppubtype = {workingpaper}
}
We report the observation and control of ultrafast non-equilibrium many-body electron dynamics in Rydberg-excited spatially-ordered ultracold atoms created from a three-dimensional unity-filling atomic Mott insulator. By implementing time-domain Ramsey interferometry with attosecond precision in our Rydberg atomic system, we observe picosecond-scale ultrafast many-body dynamics that is essentially governed by the emergence and evolution of many-body correlations between long-range interacting atoms in an optical lattice. We analyze our observations with different theoretical approaches and find that quantum fluctuations have to be included beyond semi-classical descriptions to describe the observed dynamics. Our Rydberg lattice platform combined with an ultrafast approach, which is robust against environmental noises, opens the door for simulating strongly-correlated electron dynamics by long-range van der Waals interaction and resonant dipole-dipole interaction to the charge-overlapping regime in synthetic ultracold atomic crystals.
Canzhu Tan, Xiaodong Lin, Yabing Zhou, Y. H. Jiang, Matthias Weidemüller, Bing Zhu
Dynamics of position disordered Ising spins with a soft-core potential Journal Article
In: Phys. Rev. B, vol. 105, pp. 104204, 2022.
@article{tan2021,
title = {Dynamics of position disordered Ising spins with a soft-core potential},
author = {Canzhu Tan and Xiaodong Lin and Yabing Zhou and Y. H. Jiang and Matthias Weidemüller and Bing Zhu},
doi = {10.1103/PhysRevB.105.104204},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {Phys. Rev. B},
volume = {105},
pages = {104204},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Saba Zia Hassan, Jonas Tauch, Milaim Kas, Markus Nötzold, Roland Wester, Matthias Weidemüller
Quantum state-dependent anion-neutral detachment processes Journal Article
In: J. Chem. Phys., vol. 156, pp. 094304, 2022.
@article{hassan2021b,
title = {Quantum state-dependent anion-neutral detachment processes},
author = {Saba Zia Hassan and Jonas Tauch and Milaim Kas and Markus Nötzold and Roland Wester and Matthias Weidemüller},
url = {https://doi.org/10.1063/5.0082734},
doi = {10.1063/5.0082734},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {J. Chem. Phys.},
volume = {156},
pages = {094304},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Saba Zia Hassan, Jonas Tauch, Milaim Kas, Markus Nötzold, Henry López Carrera, Eric S. Endres, Roland Wester, Matthias Weidemüller
Associative detachment in anion-atom reactions involving a dipole-bound electron Journal Article
In: Nat. Comm., vol. 13, pp. 818, 2022.
@article{hassan2021a,
title = {Associative detachment in anion-atom reactions involving a dipole-bound electron},
author = {Saba Zia Hassan and Jonas Tauch and Milaim Kas and Markus Nötzold and Henry López Carrera and Eric S. Endres and Roland Wester and Matthias Weidemüller},
url = {https://doi.org/10.1038/s41467-022-28382-w},
doi = {10.1038/s41467-022-28382-w},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {Nat. Comm.},
volume = {13},
pages = {818},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Philipp Schultzen, Titus Franz, Sebastian Geier, Andre Salzinger, Annika Tebben, Clément Hainaut, Gerhard Zürn, Matthias Weidemüller, Martin Gärttner
Glassy quantum dynamics of disordered Ising spins Journal Article
In: Phys. Rev. B, vol. 105, pp. L020201, 2022.
@article{schultzen2022a,
title = {Glassy quantum dynamics of disordered Ising spins},
author = {Philipp Schultzen and Titus Franz and Sebastian Geier and Andre Salzinger and Annika Tebben and Clément Hainaut and Gerhard Zürn and Matthias Weidemüller and Martin Gärttner},
url = {https://doi.org/10.1103/PhysRevB.105.L020201},
doi = {10.1103/PhysRevB.105.L020201},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {Phys. Rev. B},
volume = {105},
pages = {L020201},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Philipp Schultzen, Titus Franz, Clément Hainaut, Sebastian Geier, Andre Salzinger, Annika Tebben, Gerhard Zürn, Martin Gärttner, Matthias Weidemüller
Semiclassical simulations predict glassy dynamics for disordered Heisenberg models Journal Article
In: Phys. Rev. B, 2022.
@article{schultzen2022b,
title = {Semiclassical simulations predict glassy dynamics for disordered Heisenberg models},
author = {Philipp Schultzen and Titus Franz and Clément Hainaut and Sebastian Geier and Andre Salzinger and Annika Tebben and Gerhard Zürn and Martin Gärttner and Matthias Weidemüller},
url = {https://arxiv.org/abs/2107.13314},
doi = {10.1103/PhysRevB.105.L100201},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {Phys. Rev. B},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
P. Scholl, H. J. Williams, G. Bornet, F. Wallner, D. Barredo, T. Lahaye, L. Henriet, A. Signoles, C. Hainaut, T. Franz, S. Geier, A. Tebben, G. Zürn, A. Salzinger, M. Weidemüller, A. Browaeys
Microwave-engineering of programmable XXZ Hamiltonians in arrays of Rydberg atoms Journal Article
In: Phys. Rev. X Quantum, vol. 3, pp. 020303, 2022.
@article{scholl2021,
title = {Microwave-engineering of programmable XXZ Hamiltonians in arrays of Rydberg atoms},
author = {P. Scholl and H. J. Williams and G. Bornet and F. Wallner and D. Barredo and T. Lahaye and L. Henriet and A. Signoles and C. Hainaut and T. Franz and S. Geier and A. Tebben and G. Zürn and A. Salzinger and M. Weidemüller and A. Browaeys},
url = {https://doi.org/10.1103/PRXQuantum.3.020303},
doi = {10.1103/PRXQuantum.3.020303},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {Phys. Rev. X Quantum},
volume = {3},
pages = {020303},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Fachao Hu, Canzhu Tan, Yuhai Jiang, Matthias Weidemüller, Bing Zhu
Observation of photon recoil effects in single-beam absorption spectroscopy with an ultracold strontium gas Journal Article
In: Chin. Phys. B, vol. 31, pp. 016702, 2022.
@article{hu2021,
title = {Observation of photon recoil effects in single-beam absorption spectroscopy with an ultracold strontium gas},
author = {Fachao Hu and Canzhu Tan and Yuhai Jiang and Matthias Weidemüller and Bing Zhu},
url = {https://doi.org/10.1088/1674-1056/ac2486},
doi = {10.1088/1674-1056/ac2486},
year = {2022},
date = {2022-01-01},
journal = {Chin. Phys. B},
volume = {31},
pages = {016702},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2021
Annika Tebben
2021.
@phdthesis{nokey,
title = {Rydberg Electromagnetically Induced Transparency - A vanishing linear response, resonances, and a stationary Rydberg polariton},
author = {Annika Tebben},
url = {https://archiv.ub.uni-heidelberg.de/volltextserver/30661/, heiDOK},
year = {2021},
date = {2021-10-22},
urldate = {2021-10-22},
abstract = {Rydberg electromagnetically induced transparency (Rydberg EIT) enables extremely strong optical nonlinearities, opening the possibility for photon-photon interactions and exotic states of light. Subjects of this thesis are the development and the experimental test of semiclassical models for Rydberg EIT systems on two-photon resonance. Beyond that, this thesis opens the route towards enhanced photon-photon interactions in terms of an increased interaction time. Three major results are achieved: (i) In the semiclassical regime, we extend existing models and reveal that a two-body, two-photon resonance leads to an enhanced nonlinear optical response. (ii) We develop an experimental method to rigorously test semiclassical models of Rydberg EIT. For this purpose, we go beyond previous experimental investigations and measure transmission spectra on two-photon resonance, where the linear response of the system vanishes. We identify qualitative differences between a measured absorption feature and predictions provided by a mean-field model, a Monte-Carlo rate equation simulation, and a theory based on a pairwise treatment of atomic interactions. (iii) In the quantum regime, we propose and analyze a novel scheme to endow a stationary light polariton with a Rydberg character, resulting in a stationary Rydberg polariton. Our scheme offers the prospect for polariton interactions with increased interaction time, and thus might find application in the creation of exotic states of light.},
keywords = {},
pubstate = {published},
tppubtype = {phdthesis}
}
Rydberg electromagnetically induced transparency (Rydberg EIT) enables extremely strong optical nonlinearities, opening the possibility for photon-photon interactions and exotic states of light. Subjects of this thesis are the development and the experimental test of semiclassical models for Rydberg EIT systems on two-photon resonance. Beyond that, this thesis opens the route towards enhanced photon-photon interactions in terms of an increased interaction time. Three major results are achieved: (i) In the semiclassical regime, we extend existing models and reveal that a two-body, two-photon resonance leads to an enhanced nonlinear optical response. (ii) We develop an experimental method to rigorously test semiclassical models of Rydberg EIT. For this purpose, we go beyond previous experimental investigations and measure transmission spectra on two-photon resonance, where the linear response of the system vanishes. We identify qualitative differences between a measured absorption feature and predictions provided by a mean-field model, a Monte-Carlo rate equation simulation, and a theory based on a pairwise treatment of atomic interactions. (iii) In the quantum regime, we propose and analyze a novel scheme to endow a stationary light polariton with a Rydberg character, resulting in a stationary Rydberg polariton. Our scheme offers the prospect for polariton interactions with increased interaction time, and thus might find application in the creation of exotic states of light.
Jonas Tauch
New approaches for cooling molecular anions to the Kelvin range PhD Thesis
2021.
@phdthesis{nokey,
title = {New approaches for cooling molecular anions to the Kelvin range},
author = {Jonas Tauch},
url = {https://archiv.ub.uni-heidelberg.de/volltextserver/30105/, heiDOK},
year = {2021},
date = {2021-06-02},
abstract = {This thesis presents two anion cooling techniques based on their interaction with photons or ultracold atoms, pushing the frontier of anion cooling beyond state-of-the-art experiments. A hybrid atom-ion trap (HAITrap) is presented, combining an octupole radio frequency (rf) trap and a dark spontaneous-force optical trap for rubidium. The anions and atoms are probed via photodetachment tomography, time-of-flight thermometry and saturation absorption imaging, respectively. The anion photodetachment via a focused far-threshold laser beam removes anions selectively by their energy. This thesis reports forced evaporative cooling of OH− via dynamically moving the beam, below 4 Kelvin in 2 seconds. A derived thermodynamic model describes the evolution of anion temperature and number, including the importance of ion-ion thermalization and resulting rf-heating in such traps. It shows experimental and theoretical framework to prepare any anionic specie in a vast energy range. This thesis also reports the sympathetic cooling and the collision dynamics of anions with ultracold rubidium in a HAITrap. The cooling is experimentally demonstrated to 30(2) Kelvin for O− and 135(8) Kelvin for OH−. The different cooling behavior is explained by their dissimilar loss channels, which are identified and quantified. These limitations can be overcome in future experiments, providing a tool to cool anions translationally and internally.},
keywords = {},
pubstate = {published},
tppubtype = {phdthesis}
}
This thesis presents two anion cooling techniques based on their interaction with photons or ultracold atoms, pushing the frontier of anion cooling beyond state-of-the-art experiments. A hybrid atom-ion trap (HAITrap) is presented, combining an octupole radio frequency (rf) trap and a dark spontaneous-force optical trap for rubidium. The anions and atoms are probed via photodetachment tomography, time-of-flight thermometry and saturation absorption imaging, respectively. The anion photodetachment via a focused far-threshold laser beam removes anions selectively by their energy. This thesis reports forced evaporative cooling of OH− via dynamically moving the beam, below 4 Kelvin in 2 seconds. A derived thermodynamic model describes the evolution of anion temperature and number, including the importance of ion-ion thermalization and resulting rf-heating in such traps. It shows experimental and theoretical framework to prepare any anionic specie in a vast energy range. This thesis also reports the sympathetic cooling and the collision dynamics of anions with ultracold rubidium in a HAITrap. The cooling is experimentally demonstrated to 30(2) Kelvin for O− and 135(8) Kelvin for OH−. The different cooling behavior is explained by their dissimilar loss channels, which are identified and quantified. These limitations can be overcome in future experiments, providing a tool to cool anions translationally and internally.
Tobias Martin Wintermantel
Complex systems dynamics in laser excited ensembles of Rydberg atoms PhD Thesis
2021.
@phdthesis{nokey,
title = {Complex systems dynamics in laser excited ensembles of Rydberg atoms},
author = {Tobias Martin Wintermantel},
url = {https://archiv.ub.uni-heidelberg.de/volltextserver/29303/, heiDOK},
year = {2021},
date = {2021-01-13},
abstract = {In this thesis I present experimental and theoretical results showing that an ultracold gas under laser excitation to Rydberg states offers a controllable platform for studying the interesting complex dynamics that can emerge in driven-dissipative systems. The findings can be summarized according to the following three main insights: (i) The discovery of self-organized criticality (SOC) in our Rydberg system under facilitated excitation via three signatures: self-organization of the density to a stationary state; scale invariant behavior; and a critical response in terms of power-law distributed excitation avalanches. Additionally, we explore a mechanism inherent to our system which stabilizes the SOC state. We further investigate this stabilization via a controlled, variable driving of the system. These analyses can help answer the question of why scale invariant behavior is so prevalent in nature. (ii) A striking connection between the power-law growth of the Rydberg excitation number and epidemic spreading is found. Based on this, an epidemic network model is devised which efficiently describes the collective excitation dynamics. The importance of heterogeneity in the emergent Rydberg network and associated Griffiths effects provide a way to explain the observation of non-universal power laws. (iii) A novel quantum cellular automata implementation is proposed using atomic arrays together with multifrequency laser fields. This provides a natural framework to study the relation between microscopic processes and global dynamics, where special rules are found to generate entangled states with applications in quantum metrology and computing.},
keywords = {},
pubstate = {published},
tppubtype = {phdthesis}
}
In this thesis I present experimental and theoretical results showing that an ultracold gas under laser excitation to Rydberg states offers a controllable platform for studying the interesting complex dynamics that can emerge in driven-dissipative systems. The findings can be summarized according to the following three main insights: (i) The discovery of self-organized criticality (SOC) in our Rydberg system under facilitated excitation via three signatures: self-organization of the density to a stationary state; scale invariant behavior; and a critical response in terms of power-law distributed excitation avalanches. Additionally, we explore a mechanism inherent to our system which stabilizes the SOC state. We further investigate this stabilization via a controlled, variable driving of the system. These analyses can help answer the question of why scale invariant behavior is so prevalent in nature. (ii) A striking connection between the power-law growth of the Rydberg excitation number and epidemic spreading is found. Based on this, an epidemic network model is devised which efficiently describes the collective excitation dynamics. The importance of heterogeneity in the emergent Rydberg network and associated Griffiths effects provide a way to explain the observation of non-universal power laws. (iii) A novel quantum cellular automata implementation is proposed using atomic arrays together with multifrequency laser fields. This provides a natural framework to study the relation between microscopic processes and global dynamics, where special rules are found to generate entangled states with applications in quantum metrology and computing.
Binh Tran, Michael Rautenberg, Manuel Gerken, Eleonora Lippi, Bing Zhu, Juris Ulmanis, Moritz Drescher, Manfred Salmhofer, Tilman Enss, Matthias Weidemüller
Fermions meet two bosons -- the heteronuclear Efimov effect revisited Journal Article
In: Braz. J. Phys., vol. 51, pp. 316, 2021.
@article{tran2020fermions,
title = {Fermions meet two bosons -- the heteronuclear Efimov effect revisited},
author = {Binh Tran and Michael Rautenberg and Manuel Gerken and Eleonora Lippi and Bing Zhu and Juris Ulmanis and Moritz Drescher and Manfred Salmhofer and Tilman Enss and Matthias Weidemüller},
url = {https://doi.org/10.1007/s13538-020-00811-5},
doi = {10.1007/s13538-020-00811-5},
year = {2021},
date = {2021-01-01},
urldate = {2020-01-01},
journal = {Braz. J. Phys.},
volume = {51},
pages = {316},
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pubstate = {published},
tppubtype = {article}
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Chang Qiao, Canzhu Tan, Julia Siegl, Fachao Hu, Zhijing Niu, Yuhai Jiang, Matthias Weidemüller, Bing Zhu
Rydberg blockade in an ultracold strontium gas revealed by two-photon excitation dynamics Journal Article
In: Phys. Rev. A, vol. 103, pp. 063313, 2021.
@article{Qiao2021,
title = {Rydberg blockade in an ultracold strontium gas revealed by two-photon excitation dynamics},
author = {Chang Qiao and Canzhu Tan and Julia Siegl and Fachao Hu and Zhijing Niu and Yuhai Jiang and Matthias Weidemüller and Bing Zhu},
url = {https://doi.org/10.1103/PhysRevA.103.063313},
doi = {10.1103/PhysRevA.103.063313},
year = {2021},
date = {2021-01-01},
urldate = {2021-01-01},
journal = {Phys. Rev. A},
volume = {103},
pages = {063313},
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pubstate = {published},
tppubtype = {article}
}
A. Signoles, T. Franz, R. Ferracini Alves, M. Gärttner, S. Whitlock, G. Zürn, M. Weidemüller
Observation of glassy dynamics in a disordered quantum spin system Journal Article
In: Phys. Rev. X, vol. 11, pp. 011011, 2021.
@article{signoles2019,
title = {Observation of glassy dynamics in a disordered quantum spin system},
author = {A. Signoles and T. Franz and R. Ferracini Alves and M. Gärttner and S. Whitlock and G. Zürn and M. Weidemüller},
url = {https://doi.org/10.1103/PhysRevX.11.011011},
doi = {10.1103/PhysRevX.11.011011},
year = {2021},
date = {2021-01-01},
urldate = {2021-01-01},
journal = {Phys. Rev. X},
volume = {11},
pages = {011011},
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Annika Tebben, Clément Hainaut, Andre Salzinger, Sebastian Geier, Titus Franz, Thomas Pohl, Martin Gärttner, Gerhard Zürn, Matthias Weidemüller
Nonlinear absorption in interacting Rydberg electromagnetically-induced-transparency spectra on two-photon resonance Journal Article
In: Phys. Rev. A, vol. 103, pp. 063710, 2021.
@article{Tebben2021,
title = {Nonlinear absorption in interacting Rydberg electromagnetically-induced-transparency spectra on two-photon resonance},
author = {Annika Tebben and Clément Hainaut and Andre Salzinger and Sebastian Geier and Titus Franz and Thomas Pohl and Martin Gärttner and Gerhard Zürn and Matthias Weidemüller},
url = {https://doi.org/10.1103/PhysRevA.103.063710},
doi = {10.1103/PhysRevA.103.063710},
year = {2021},
date = {2021-01-01},
urldate = {2021-01-01},
journal = {Phys. Rev. A},
volume = {103},
pages = {063710},
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}
Christiane Stutterheim, Matthias Weidemüller
Was die Welt zusammenhält: Babel und Bubbles Online
2021, visited: 01.01.2021.
@online{weidemueller2021,
title = {Was die Welt zusammenhält: Babel und Bubbles},
author = {Christiane Stutterheim and Matthias Weidemüller},
url = {https://heiup.uni-heidelberg.de/journals/index.php/rupertocarola/article/view/24358},
doi = {doi.org/10.17885/heiup.ruca.2021.18.24358},
year = {2021},
date = {2021-01-01},
urldate = {2021-01-01},
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Sebastian Geier, Nithiwadee Thaicharoen, Clément Hainaut, Titus Franz, Andre Salzinger, Annika Tebben, David Grimshandl, Gerhard Zürn, Matthias Weidemüller
Floquet Hamiltonian Engineering of an Isolated Many-Body Spin System Journal Article
In: Science, vol. 374, pp. 1149, 2021.
@article{geier2021,
title = {Floquet Hamiltonian Engineering of an Isolated Many-Body Spin System},
author = {Sebastian Geier and Nithiwadee Thaicharoen and Clément Hainaut and Titus Franz and Andre Salzinger and Annika Tebben and David Grimshandl and Gerhard Zürn and Matthias Weidemüller},
url = {https://doi.org/10.1126/science.abd9547},
doi = {10.1126/science.abd9547},
year = {2021},
date = {2021-01-01},
urldate = {2021-01-01},
journal = {Science},
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2020
Tilman Enss, Binh Tran, Michael Rautenberg, Manuel Gerken, Eleonora Lippi, Moritz Drescher, Bing Zhu, Matthias Weidemüller, Manfred Salmhofer
Scattering of two heavy Fermi polarons: resonances and quasi-bound states Journal Article
In: Phys. Rev. A, vol. 102, pp. 063321, 2020.
@article{enss2020,
title = {Scattering of two heavy Fermi polarons: resonances and quasi-bound states},
author = {Tilman Enss and Binh Tran and Michael Rautenberg and Manuel Gerken and Eleonora Lippi and Moritz Drescher and Bing Zhu and Matthias Weidemüller and Manfred Salmhofer},
url = {https://doi.org/10.1103/PhysRevA.102.063321},
doi = {10.1103/PhysRevA.102.063321},
year = {2020},
date = {2020-01-01},
urldate = {2020-01-01},
journal = {Phys. Rev. A},
volume = {102},
pages = {063321},
keywords = {},
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Junyang Yuan, Yixuan Ma, Renyuan Li, Huanyu Ma, Yizhu Zhang, Difa Ye, Zhenjie Shen, Tianmin Yan, Xincheng Wang, Matthias Weidemüller
Momentum Spectroscopy for Multiple Ionization of Cold Rubidium in the Elliptically Polarized Laser Field Journal Article
In: Chin. Phys. Lett., vol. 37, no. 5, pp. 053201, 2020.
@article{Yuan2020,
title = {Momentum Spectroscopy for Multiple Ionization of Cold Rubidium in the Elliptically Polarized Laser Field},
author = {Junyang Yuan and Yixuan Ma and Renyuan Li and Huanyu Ma and Yizhu Zhang and Difa Ye and Zhenjie Shen and Tianmin Yan and Xincheng Wang and Matthias Weidemüller},
url = {http://cpl.iphy.ac.cn/EN/abstract/article_105578.shtml},
doi = {10.1088/0256-307X/37/5/053201},
year = {2020},
date = {2020-01-01},
urldate = {2020-01-01},
journal = {Chin. Phys. Lett.},
volume = {37},
number = {5},
pages = {053201},
publisher = {Chin. Phys. Lett.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Junyang Yuan, Shiwei Liu, Xincheng Wang, Zhenjie Shen, Yixuan Ma, Huanyu Ma, Qiuxiang Meng, Tian-Min Yan, Yizhu Zhang, Alexander Dorn, Matthias Weidemüller, Difa Ye, Yuhai Jiang
Ellipticity-dependent sequential over-barrier ionization of cold rubidium Journal Article
In: Phys. Rev. A, vol. 102, pp. 043112, 2020.
@article{Yuan2020b,
title = {Ellipticity-dependent sequential over-barrier ionization of cold rubidium},
author = {Junyang Yuan and Shiwei Liu and Xincheng Wang and Zhenjie Shen and Yixuan Ma and Huanyu Ma and Qiuxiang Meng and Tian-Min Yan and Yizhu Zhang and Alexander Dorn and Matthias Weidemüller and Difa Ye and Yuhai Jiang},
url = {https://link.aps.org/doi/10.1103/PhysRevA.102.043112},
doi = {10.1103/PhysRevA.102.043112},
year = {2020},
date = {2020-01-01},
journal = {Phys. Rev. A},
volume = {102},
pages = {043112},
keywords = {},
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Michiteru Mizoguchi, Yichi Zhang, Masaya Kunimi, Akira Tanaka, Shuntaro Takeda, Nobuyuki Takei, Vineet Bharti, Kuniaki Koyasu, Tetsuo Kishimoto, Dieter Jaksch, Alexander Glaetzle, Martin Kiffner, Guido Masella, Guido Pupillo, Matthias Weidemüller, Kenji Ohmori
Ultrafast creation of overlapping Rydberg electrons in an atomic BEC and Mott-insulator lattice Journal Article
In: Phys. Rev. Lett., vol. 124, pp. 253201, 2020.
@article{Mizoguchi2019,
title = {Ultrafast creation of overlapping Rydberg electrons in an atomic BEC and Mott-insulator lattice},
author = {Michiteru Mizoguchi and Yichi Zhang and Masaya Kunimi and Akira Tanaka and Shuntaro Takeda and Nobuyuki Takei and Vineet Bharti and Kuniaki Koyasu and Tetsuo Kishimoto and Dieter Jaksch and Alexander Glaetzle and Martin Kiffner and Guido Masella and Guido Pupillo and Matthias Weidemüller and Kenji Ohmori},
url = {https://doi.org/10.1103/PhysRevLett.124.253201},
doi = {10.1103/PhysRevLett.124.2532017},
year = {2020},
date = {2020-01-01},
journal = {Phys. Rev. Lett.},
volume = {124},
pages = {253201},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
M Ferreira-Cao, V Gavryusev, T Franz, R Ferracini Alves, A Signoles, G Zürn, M Weidemüller
Depletion imaging of Rydberg atoms in cold atomic gases Journal Article
In: J. Phys. B: At. Mol. Opt. Phys., vol. 53, iss. 8, pp. 084005, 2020.
@article{Cao2020,
title = {Depletion imaging of Rydberg atoms in cold atomic gases},
author = {M Ferreira-Cao and V Gavryusev and T Franz and R Ferracini Alves and A Signoles and G Zürn and M Weidemüller},
url = {https://doi.org/10.1088/1361-6455/ab7427},
doi = {10.1088/1361-6455/ab7427},
year = {2020},
date = {2020-01-01},
urldate = {2020-01-01},
journal = {J. Phys. B: At. Mol. Opt. Phys.},
volume = {53},
issue = {8},
pages = {084005},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Charles Möhl, Nicholas Spong, Yuechun Jiao, Chloe So, Teodora Ilieva, Matthias Weidemüller, Charles S Adams
Photon correlation transients in a weakly blockaded Rydberg ensemble Journal Article
In: J. Phys. B: At. Mol. Opt. Phys., vol. 53, iss. 8, pp. 084004, 2020.
@article{Moehl2020,
title = {Photon correlation transients in a weakly blockaded Rydberg ensemble},
author = {Charles Möhl and Nicholas Spong and Yuechun Jiao and Chloe So and Teodora Ilieva and Matthias Weidemüller and Charles S Adams},
url = {https://doi.org/10.1088/1361-6455/ab728f},
doi = {10.1088/1361-6455/ab728f},
year = {2020},
date = {2020-01-01},
urldate = {2020-01-01},
journal = {J. Phys. B: At. Mol. Opt. Phys.},
volume = {53},
issue = {8},
pages = {084004},
keywords = {},
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David Grimshandl, Manuel Gerken, Eleonora Lippi, Binh Tran, Saba Zia Hassan, Jan Hendrik Becher, Selim Jochim, Matthias Weidemüller, Gunnar Föhner, Steffen Brucker, Frank Schumacher, Wolfgang Beldermann, Venelin Angelov, Stefan Hetzel, Stefan Hummel, Simon Muley, Bernd Windelband, Christoph Eisner, Marco Zugaj, Philipp Bayer, Dario Ernst, Marcel Gehrlein, Helmut Jacob, Jens Pfeifle, Andreas Treskatsch, Martin Ulmschneider, Philipp M. Preiss
The HDvent Emergency Ventilator System Working paper
arXiv e-prints: 2012.13005, 2020.
@workingpaper{grimshandl2020hdvent,
title = {The HDvent Emergency Ventilator System},
author = {David Grimshandl and Manuel Gerken and Eleonora Lippi and Binh Tran and Saba Zia Hassan and Jan Hendrik Becher and Selim Jochim and Matthias Weidemüller and Gunnar Föhner and Steffen Brucker and Frank Schumacher and Wolfgang Beldermann and Venelin Angelov and Stefan Hetzel and Stefan Hummel and Simon Muley and Bernd Windelband and Christoph Eisner and Marco Zugaj and Philipp Bayer and Dario Ernst and Marcel Gehrlein and Helmut Jacob and Jens Pfeifle and Andreas Treskatsch and Martin Ulmschneider and Philipp M. Preiss},
url = {https://arxiv.org/abs/2012.13005},
doi = {10.48550/arXiv.2012.13005},
year = {2020},
date = {2020-01-01},
urldate = {2020-01-01},
journal = {arXiv:2012.13005},
howpublished = {arXiv e-prints: 2012.13005},
keywords = {},
pubstate = {published},
tppubtype = {workingpaper}
}
Markus Nötzold, Saba Zia Hassan, Jonas Tauch, Eric Enerds, Roland Wester, Matthias Weidemüller
Thermometry in a Multipole Ion Trap Journal Article
In: Appl. Sci., vol. 10, pp. 5264, 2020.
@article{Noetzold2020,
title = {Thermometry in a Multipole Ion Trap},
author = {Markus Nötzold and Saba Zia Hassan and Jonas Tauch and Eric Enerds and Roland Wester and Matthias Weidemüller},
url = {https://doi.org/10.3390/app10155264},
doi = {10.3390/app10155264},
year = {2020},
date = {2020-01-01},
urldate = {2020-01-01},
journal = {Appl. Sci.},
volume = {10},
pages = {5264},
keywords = {},
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tppubtype = {article}
}
Marcel Neugebauer, Laurin Fischer, Alexander Jäger, Stefanie Czischek, Selim Jochim, Matthias Weidemüller, Martin Gärttner
Neural network quantum state tomography in a two-qubit experiment Journal Article
In: Phys. Rev. A, vol. 102, pp. 042604, 2020.
@article{Neugebauer2020,
title = {Neural network quantum state tomography in a two-qubit experiment},
author = {Marcel Neugebauer and Laurin Fischer and Alexander Jäger and Stefanie Czischek and Selim Jochim and Matthias Weidemüller and Martin Gärttner},
url = {https://doi.org/10.1103/PhysRevA.102.042604},
doi = {10.1103/PhysRevA.102.042604},
year = {2020},
date = {2020-01-01},
journal = {Phys. Rev. A},
volume = {102},
pages = {042604},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Matthias Weidemüller
Kollektiv am kritischen Punkt Journal Article
In: Physik Journal, vol. 19, iss. 8, pp. 24, 2020.
@article{Weidemueller2020,
title = {Kollektiv am kritischen Punkt},
author = {Matthias Weidemüller},
url = {https://www.pro-physik.de/physik-journal/august-september-2020},
year = {2020},
date = {2020-01-01},
journal = {Physik Journal},
volume = {19},
issue = {8},
pages = {24},
keywords = {},
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2019
Annika Tebben, Clément Hainaut, Valentin Walther, Yong-Chang Zhang, Gerhard Zürn, Thomas Pohl, Matthias Weidemüller
Blockade-induced resonant enhancement of the optical nonlinearity in a Rydberg medium Journal Article
In: Phys. Rev. A, vol. 100, iss. 6, pp. 063812, 2019.
@article{tebben2019,
title = {Blockade-induced resonant enhancement of the optical nonlinearity in a Rydberg medium},
author = {Annika Tebben and Clément Hainaut and Valentin Walther and Yong-Chang Zhang and Gerhard Zürn and Thomas Pohl and Matthias Weidemüller},
url = {https://link.aps.org/doi/10.1103/PhysRevA.100.063812},
doi = {10.1103/PhysRevA.100.063812},
year = {2019},
date = {2019-12-01},
journal = {Phys. Rev. A},
volume = {100},
issue = {6},
pages = {063812},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
S. Whitlock, H. Wildhagen, H. Weimer, M. Weidemüller
Diffusive to non-ergodic dipolar transport in a dissipative atomic medium Journal Article
In: Phys. Rev. Lett., vol. 123, pp. 213606, 2019.
@article{whitlock2019,
title = {Diffusive to non-ergodic dipolar transport in a dissipative atomic medium},
author = {S. Whitlock and H. Wildhagen and H. Weimer and M. Weidemüller},
url = {https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.123.213606},
doi = {10.1103/PhysRevLett.123.213606},
year = {2019},
date = {2019-11-01},
journal = {Phys. Rev. Lett.},
volume = {123},
pages = {213606},
publisher = {American Physical Society},
keywords = {},
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Manuel Gerken, Binh Tran, Stephan Häfner, Eberhard Tiemann, Bing Zhu, Matthias Weidemüller
Observation of dipolar splittings in high-resolution atom-loss spectroscopy of $^6$Li $p$-wave Feshbach resonances Journal Article
In: Phys. Rev. A (Rapid Comm.), vol. 100, iss. 5, pp. 050701, 2019.
@article{gerken2019,
title = {Observation of dipolar splittings in high-resolution atom-loss spectroscopy of $^6$Li $p$-wave Feshbach resonances},
author = {Manuel Gerken and Binh Tran and Stephan Häfner and Eberhard Tiemann and Bing Zhu and Matthias Weidemüller},
url = {https://link.aps.org/doi/10.1103/PhysRevA.100.050701},
doi = {10.1103/PhysRevA.100.050701},
year = {2019},
date = {2019-11-01},
urldate = {2019-11-01},
journal = {Phys. Rev. A (Rapid Comm.)},
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Fachao Hu, Ingo Nosske, Luc Couturier, Canzhu Tan, Chang Qiao, Peng Chen, Y. H. Jiang, Bing Zhu, Matthias Weidemüller
Analyzing a single-laser repumping scheme for efficient loading of a strontium magneto-optical trap Journal Article
In: Phys. Rev. A, vol. 99, iss. 3, pp. 033422, 2019.
@article{Hu2019,
title = {Analyzing a single-laser repumping scheme for efficient loading of a strontium magneto-optical trap},
author = {Fachao Hu and Ingo Nosske and Luc Couturier and Canzhu Tan and Chang Qiao and Peng Chen and Y. H. Jiang and Bing Zhu and Matthias Weidemüller},
url = {https://link.aps.org/doi/10.1103/PhysRevA.99.033422},
doi = {10.1103/PhysRevA.99.033422},
year = {2019},
date = {2019-03-01},
journal = {Phys. Rev. A},
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issue = {3},
pages = {033422},
publisher = {American Physical Society},
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R. Li, J. Yuan, X. Wang, X. Hou, S. Zhang, Z. Zhu, Y. Ma, Q. Gao, Z. Wang, T. M. Yan, C. Qin, S. Li, Y. Zhang, M. Weidemüller, Y. H. Jiang
Recoil-ion momentum spectroscopy for cold rubidium in a strong femtosecond laser field Journal Article
In: Journal of Instrumentation, vol. 14, no. 02, pp. P02022, 2019.
@article{Li_2019,
title = {Recoil-ion momentum spectroscopy for cold rubidium in a strong femtosecond laser field},
author = {R. Li and J. Yuan and X. Wang and X. Hou and S. Zhang and Z. Zhu and Y. Ma and Q. Gao and Z. Wang and T. M. Yan and C. Qin and S. Li and Y. Zhang and M. Weidemüller and Y. H. Jiang},
url = {https://iopscience.iop.org/article/10.1088/1748-0221/14/02/P02022/meta},
doi = {10.1088/1748-0221/14/02/p02022},
year = {2019},
date = {2019-02-01},
journal = {Journal of Instrumentation},
volume = {14},
number = {02},
pages = {P02022},
publisher = {IOP Publishing},
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Luc Couturier, Ingo Nosske, Fachao Hu, Canzhu Tan, Chang Qiao, Y. H. Jiang, Peng Chen, Matthias Weidemüller
Measurement of the strontium triplet Rydberg series by depletion spectroscopy of ultracold atoms Journal Article
In: Phys. Rev. A, vol. 99, iss. 2, pp. 022503, 2019.
@article{PhysRevA.99.022503,
title = {Measurement of the strontium triplet Rydberg series by depletion spectroscopy of ultracold atoms},
author = {Luc Couturier and Ingo Nosske and Fachao Hu and Canzhu Tan and Chang Qiao and Y. H. Jiang and Peng Chen and Matthias Weidemüller},
url = {https://link.aps.org/doi/10.1103/PhysRevA.99.022503},
doi = {10.1103/PhysRevA.99.022503},
year = {2019},
date = {2019-02-01},
journal = {Phys. Rev. A},
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issue = {2},
pages = {022503},
publisher = {American Physical Society},
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Bing Zhu, Stephan Häfner, Binh Tran, Manuel Gerken, Juris Ulmanis, Eberhard Tiemann, Matthias Weidemüller
High partial-wave Feshbach resonances in an ultracold $^6$Li-$^133$Cs mixture Working paper
arXiv e-prints: 1912.01264, 2019.
@workingpaper{zhu2019,
title = {High partial-wave Feshbach resonances in an ultracold $^6$Li-$^133$Cs mixture},
author = {Bing Zhu and Stephan Häfner and Binh Tran and Manuel Gerken and Juris Ulmanis and Eberhard Tiemann and Matthias Weidemüller},
url = {https://arxiv.org/abs/1912.01264},
doi = {10.48550/arXiv.1912.01264},
year = {2019},
date = {2019-01-01},
urldate = {2019-01-01},
journal = {arXiv:1912.01264},
howpublished = {arXiv e-prints: 1912.01264},
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Matthias Weidemüller
Temperaturen im Keller. Das kälteste Gas des Universums Online
2019, visited: 01.01.2019.
@online{weidemueller2019,
title = {Temperaturen im Keller. Das kälteste Gas des Universums},
author = {Matthias Weidemüller},
url = {https://heiup.uni-heidelberg.de/journals/index.php/rupertocarola/article/view/23979/17695},
year = {2019},
date = {2019-01-01},
urldate = {2019-01-01},
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Bing Zhu, Stephan Häfner, Binh Tran, Manuel Gerken, Juris Ulmanis, Eberhard Tiemann, Matthias Weidemüller
Spin-rotation coupling in p-wave Feshbach resonances Working paper
arXiv e-prints: 1910.12011, 2019.
@workingpaper{zhu2019b,
title = {Spin-rotation coupling in p-wave Feshbach resonances},
author = {Bing Zhu and Stephan Häfner and Binh Tran and Manuel Gerken and Juris Ulmanis and Eberhard Tiemann and Matthias Weidemüller},
url = {https://arxiv.org/abs/1910.12011},
doi = {10.48550/arXiv.1910.12011},
year = {2019},
date = {2019-01-01},
urldate = {2019-01-01},
journal = {arXiv:1910.12011},
howpublished = {arXiv e-prints: 1910.12011},
keywords = {},
pubstate = {published},
tppubtype = {workingpaper}
}
Chang Qiao, CZ Tan, FC Hu, Luc Couturier, Ingo Nosske, Peng Chen, YH Jiang, Bing Zhu, Matthias Weidemüller
An ultrastable laser system at 689 nm for cooling and trapping of strontium Journal Article
In: Applied Physics B, vol. 125, no. 11, pp. 215, 2019.
@article{qiao2019,
title = {An ultrastable laser system at 689 nm for cooling and trapping of strontium},
author = {Chang Qiao and CZ Tan and FC Hu and Luc Couturier and Ingo Nosske and Peng Chen and YH Jiang and Bing Zhu and Matthias Weidemüller},
url = {https://link.springer.com/article/10.1007/s00340-019-7328-3},
doi = {10.1007/s00340-019-7328-3},
year = {2019},
date = {2019-01-01},
urldate = {2019-01-01},
journal = {Applied Physics B},
volume = {125},
number = {11},
pages = {215},
publisher = {Springer},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Andrea Bergschneider, Vincent M Klinkhamer, Jan Hendrik Becher, Ralf Klemt, Lukas Palm, Gerhard Zürn, Selim Jochim, Philipp M Preiss
Experimental characterization of two-particle entanglement through position and momentum correlations Journal Article
In: Nature Physics, vol. 15, no. 7, pp. 640–644, 2019, ISSN: 1745-2481.
@article{Bergschneider2019,
title = {Experimental characterization of two-particle entanglement through position and momentum correlations},
author = {Andrea Bergschneider and Vincent M Klinkhamer and Jan Hendrik Becher and Ralf Klemt and Lukas Palm and Gerhard Zürn and Selim Jochim and Philipp M Preiss},
url = {https://doi.org/10.1038/s41567-019-0508-6},
doi = {10.1038/s41567-019-0508-6},
issn = {1745-2481},
year = {2019},
date = {2019-01-01},
urldate = {2019-01-01},
journal = {Nature Physics},
volume = {15},
number = {7},
pages = {640--644},
abstract = {Quantum simulation is a rapidly advancing tool for gaining insight into complex quantum states and their dynamics. Trapped-ion systems have pioneered deterministic state preparation and comprehensive state characterization, operating on localized and thus distinguishable particles1. With ultracold atom experiments, one can prepare large samples of delocalized particles, but the same level of characterization has not yet been achieved2. Here, we present a method to measure the positions and momenta of individual particles to obtain correlations and coherences. We demonstrate this with deterministically prepared samples of two interacting ultracold fermions in a coupled double well3. As a first application, we use our technique to certify and quantify different types of entanglement4–6.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Quantum simulation is a rapidly advancing tool for gaining insight into complex quantum states and their dynamics. Trapped-ion systems have pioneered deterministic state preparation and comprehensive state characterization, operating on localized and thus distinguishable particles1. With ultracold atom experiments, one can prepare large samples of delocalized particles, but the same level of characterization has not yet been achieved2. Here, we present a method to measure the positions and momenta of individual particles to obtain correlations and coherences. We demonstrate this with deterministically prepared samples of two interacting ultracold fermions in a coupled double well3. As a first application, we use our technique to certify and quantify different types of entanglement4–6.
2018
Diego A. Alcala, Gregor Urban, Matthias Weidemüller, Lincoln D. Carr
Macroscopic quantum escape of Bose-Einstein condensates: Analysis of experimentally realizable quasi-one-dimensional traps Journal Article
In: Phys. Rev. A, vol. 98, iss. 2, pp. 023619, 2018.
@article{PhysRevA.98.023619,
title = {Macroscopic quantum escape of Bose-Einstein condensates: Analysis of experimentally realizable quasi-one-dimensional traps},
author = {Diego A. Alcala and Gregor Urban and Matthias Weidemüller and Lincoln D. Carr},
url = {https://link.aps.org/doi/10.1103/PhysRevA.98.023619},
doi = {10.1103/PhysRevA.98.023619},
year = {2018},
date = {2018-08-01},
journal = {Phys. Rev. A},
volume = {98},
issue = {2},
pages = {023619},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Sebastian Lackner, Andreas Spitz, Matthias Weidemüller, Michael Gertz
Efficient anti-community detection in complex networks Conference
SSDBM '18: Proceedings of the 30th International Conference on Scientific and Statistical Database Management, no. 16, ACM, 2018, ISBN: 978-1-4503-6505-5.
@conference{lackner_efficient_2018,
title = {Efficient anti-community detection in complex networks},
author = {Sebastian Lackner and Andreas Spitz and Matthias Weidemüller and Michael Gertz},
url = {https://dl.acm.org/doi/10.1145/3221269.3221289},
doi = {10.1145/3221269.3221289},
isbn = {978-1-4503-6505-5},
year = {2018},
date = {2018-07-01},
urldate = {2018-07-01},
booktitle = {SSDBM '18: Proceedings of the 30th International Conference on Scientific and Statistical Database Management},
number = {16},
pages = {1-12},
publisher = {ACM},
howpublished = {ACM digital library: },
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Andrea Bergschneider, Vincent M Klinkhamer, Jan Hendrik Becher, Ralf Klemt, Gerhard Zürn, Philipp M Preiss, Selim Jochim
Spin-resolved single-atom imaging of $textasciicircum6textbackslashmathrmLi$ in free space Journal Article
In: Physical Review A, vol. 97, no. 6, pp. 63613, 2018, (Publisher: American Physical Society).
@article{Bergschneider2018,
title = {Spin-resolved single-atom imaging of $textasciicircum6textbackslashmathrmLi$ in free space},
author = {Andrea Bergschneider and Vincent M Klinkhamer and Jan Hendrik Becher and Ralf Klemt and Gerhard Zürn and Philipp M Preiss and Selim Jochim},
url = {https://link.aps.org/doi/10.1103/PhysRevA.97.063613},
doi = {10.1103/PhysRevA.97.063613},
year = {2018},
date = {2018-06-01},
urldate = {2018-06-01},
journal = {Physical Review A},
volume = {97},
number = {6},
pages = {63613},
note = {Publisher: American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A. Pineiro Orioli, A. Signoles, H. Wildhagen, G. Günter, J. Berges, S. Whitlock, M. Weidemüller
Relaxation of an Isolated Dipolar-Interacting Rydberg Quantum Spin System Journal Article
In: Phys. Rev. Lett., vol. 120, iss. 6, pp. 063601, 2018.
@article{Orioli2018,
title = {Relaxation of an Isolated Dipolar-Interacting Rydberg Quantum Spin System},
author = {A. Pineiro Orioli and A. Signoles and H. Wildhagen and G. Günter and J. Berges and S. Whitlock and M. Weidemüller},
url = {https://link.aps.org/doi/10.1103/PhysRevLett.120.063601},
doi = {10.1103/PhysRevLett.120.063601},
year = {2018},
date = {2018-02-01},
journal = {Phys. Rev. Lett.},
volume = {120},
issue = {6},
pages = {063601},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Puneet A Murthy, Mathias Neidig, Ralf Klemt, Luca Bayha, Igor Boettcher, Tilman Enss, Marvin Holten, Gerhard Zürn, Philipp M Preiss, Selim Jochim
High-temperature pairing in a strongly interacting two-dimensional Fermi gas Journal Article
In: Science, vol. 359, no. 6374, pp. 452 LP – 455, 2018.
@article{Murthy2018,
title = {High-temperature pairing in a strongly interacting two-dimensional Fermi gas},
author = {Puneet A Murthy and Mathias Neidig and Ralf Klemt and Luca Bayha and Igor Boettcher and Tilman Enss and Marvin Holten and Gerhard Zürn and Philipp M Preiss and Selim Jochim},
url = {http://science.sciencemag.org/content/359/6374/452.abstract},
doi = {10.1126/science.aan5950},
year = {2018},
date = {2018-01-01},
urldate = {2018-01-01},
journal = {Science},
volume = {359},
number = {6374},
pages = {452 LP -- 455},
abstract = {Cold atomic gases are extremely flexible systems; the ability to tune interactions between fermionic atoms can, for example, cause the gas to undergo a crossover from weakly interacting fermions to weakly interacting bosons via a strongly interacting unitary regime. Murthy et al. studied this crossover in a gas of fermions confined to two dimensions. The formation of atomic pairs occurred at much higher temperatures in the unitary regime than previously thought.Science, this issue p. 452The nature of the normal phase of strongly correlated fermionic systems is an outstanding question in quantum many-body physics. We used spatially resolved radio-frequency spectroscopy to measure pairing energy of fermions across a wide range of temperatures and interaction strengths in a two-dimensional gas of ultracold fermionic atoms. We observed many-body pairing at temperatures far above the critical temperature for superfluidity. In the strongly interacting regime, the pairing energy in the normal phase considerably exceeds the intrinsic two-body binding energy of the system and shows a clear dependence on local density. This implies that pairing in this regime is driven by many-body correlations, rather than two-body physics. Our findings show that pairing correlations in strongly interacting two-dimensional fermionic systems are remarkably robust against thermal fluctuations.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Cold atomic gases are extremely flexible systems; the ability to tune interactions between fermionic atoms can, for example, cause the gas to undergo a crossover from weakly interacting fermions to weakly interacting bosons via a strongly interacting unitary regime. Murthy et al. studied this crossover in a gas of fermions confined to two dimensions. The formation of atomic pairs occurred at much higher temperatures in the unitary regime than previously thought.Science, this issue p. 452The nature of the normal phase of strongly correlated fermionic systems is an outstanding question in quantum many-body physics. We used spatially resolved radio-frequency spectroscopy to measure pairing energy of fermions across a wide range of temperatures and interaction strengths in a two-dimensional gas of ultracold fermionic atoms. We observed many-body pairing at temperatures far above the critical temperature for superfluidity. In the strongly interacting regime, the pairing energy in the normal phase considerably exceeds the intrinsic two-body binding energy of the system and shows a clear dependence on local density. This implies that pairing in this regime is driven by many-body correlations, rather than two-body physics. Our findings show that pairing correlations in strongly interacting two-dimensional fermionic systems are remarkably robust against thermal fluctuations.
Luc Couturier, Ingo Nosske, Fachao Hu, Canzhu Tan, Chang Qiao, YH Jiang, Peng Chen, Matthias Weidemüller
Laser frequency stabilization using a commercial wavelength meter Journal Article
In: Review of Scientific Instruments, vol. 89, no. 4, pp. 043103, 2018.
@article{couturier2018laser,
title = {Laser frequency stabilization using a commercial wavelength meter},
author = {Luc Couturier and Ingo Nosske and Fachao Hu and Canzhu Tan and Chang Qiao and YH Jiang and Peng Chen and Matthias Weidemüller},
url = {https://aip.scitation.org/doi/10.1063/1.5025537},
doi = {10.1063/1.5025537},
year = {2018},
date = {2018-01-01},
urldate = {2018-01-01},
journal = {Review of Scientific Instruments},
volume = {89},
number = {4},
pages = {043103},
publisher = {AIP Publishing},
keywords = {},
pubstate = {published},
tppubtype = {article}
}