Senior Scientist
Phone: 19434
zuern@physi.uni-heidelberg.de
Physikalisches Institut
Universität Heidelberg
Im Neuenheimer Feld 226
69120, Heidelberg, Germany
Publications
2022
Schultzen P, Franz T, Hainaut C, Geier S, Salzinger A, Tebben A, Zürn G, Gärttner M, Weidemüller M
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}
}
Schultzen P, Franz T, Geier S, Salzinger A, Tebben A, Hainaut C, Zürn G, Weidemüller M, Gärttner M
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}
}
Scholl P, Williams H J, Bornet G, Wallner F, Barredo D, Lahaye T, Henriet L, Signoles A, Hainaut C, Franz T, Geier S, Tebben A, Zürn G, Salzinger A, Weidemüller M, Browaeys A
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}
}
2021
Tebben A, Hainaut C, Salzinger A, Geier S, Franz T, Pohl T, Gärttner M, Zürn G, Weidemüller M
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},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Geier S, Thaicharoen N, Hainaut C, Franz T, Salzinger A, Tebben A, Grimshandl D, Zürn G, Weidemüller M
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},
volume = {374},
pages = {1149},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Signoles A, Franz T, Alves R F, Gärttner M, Whitlock S, Zürn G, Weidemüller M
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},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2020
Ferreira-Cao M, Gavryusev V, Franz T, Alves R F, Signoles A, Zürn G, Weidemüller M
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}
}
2019
Tebben A, Hainaut C, Walther V, Zhang Y, Zürn G, Pohl T, Weidemüller M
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}
}
Bergschneider A, Klinkhamer V M, Becher J H, Klemt R, Palm L, Zürn G, Jochim S, Preiss P M
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
Bergschneider A, Klinkhamer V M, Becher J H, Klemt R, Zürn G, Preiss P M, Jochim S
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}
}
Murthy P A, Neidig M, Klemt R, Bayha L, Boettcher I, Enss T, Holten M, Zürn G, Preiss P M, Jochim S
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.
2017
Murthy P A, Neidig M, Klemt R, Bayha L, Boettcher I, Enss T, Holten M, Zürn G, Preiss P M, Jochim S
High-temperature pairing in a strongly interacting two-dimensional Fermi gas Journal Article
In: Science, 2017.
@article{Murthy2017,
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/early/2017/12/20/science.aan5950.abstract},
year = {2017},
date = {2017-12-01},
urldate = {2017-12-01},
journal = {Science},
abstract = {The nature of the normal phase of strongly correlated fermionic systems is an outstanding question in quantum many-body physics. We use 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 observe many-body pairing at temperatures far above the critical temperature for superfluidity. In the strongly interacting regime, the pairing energy in the normal phase significantly 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}
}
The nature of the normal phase of strongly correlated fermionic systems is an outstanding question in quantum many-body physics. We use 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 observe many-body pairing at temperatures far above the critical temperature for superfluidity. In the strongly interacting regime, the pairing energy in the normal phase significantly 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.
2016
Gavryusev V, Signoles A, Ferreira-Cao M, Zürn G, Hofmann C S, Günter G, Schempp H, Robert-de-Saint-Vincent M, Whitlock S, Weidemüller M
Density matrix reconstruction of three-level atoms via Rydberg electromagnetically induced transparency Journal Article
In: Journal of Physics B: Atomic, Molecular and Optical Physics, vol. 49, no. 16, pp. 164002, 2016.
@article{Gavryusev2016a,
title = {Density matrix reconstruction of three-level atoms via Rydberg electromagnetically induced transparency},
author = {V. Gavryusev and A. Signoles and M. Ferreira-Cao and G. Zürn and C. S. Hofmann and G. Günter and H. Schempp and M. Robert-de-Saint-Vincent and S. Whitlock and M. Weidemüller},
url = {http://iopscience.iop.org/article/10.1088/0953-4075/49/16/164002},
doi = {10.1088/0953-4075/49/16/164002},
year = {2016},
date = {2016-01-01},
urldate = {2016-01-01},
journal = {Journal of Physics B: Atomic, Molecular and Optical Physics},
volume = {49},
number = {16},
pages = {164002},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Gavryusev V, Ferreira-Cao M, Kekić A, Zürn G, Signoles A
Interaction Enhanced Imaging of Rydberg P states Journal Article
In: The European Physical Journal Special Topics, vol. 225, no. 15, pp. 2863–2889, 2016.
@article{Gavryusev2016,
title = {Interaction Enhanced Imaging of Rydberg P states},
author = {V. Gavryusev and M. Ferreira-Cao and A. Kekić and G. Zürn and A. Signoles},
url = {http://dx.doi.org/10.1140/epjst/e2015-50339-8},
doi = {10.1140/epjst/e2015-50339-8},
year = {2016},
date = {2016-01-01},
journal = {The European Physical Journal Special Topics},
volume = {225},
number = {15},
pages = {2863--2889},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Boettcher I, Bayha L, Kedar D, Murthy P A, Neidig M, Ries M G, Wenz A N, Zürn G, Jochim S, Enss T
Equation of State of Ultracold Fermions in the 2D BEC-BCS Crossover Region Journal Article
In: Physical Review Letters, vol. 116, no. 4, pp. 45303, 2016, (Publisher: American Physical Society).
@article{Boettcher2016,
title = {Equation of State of Ultracold Fermions in the 2D BEC-BCS Crossover Region},
author = {I Boettcher and L Bayha and D Kedar and P. A. Murthy and M Neidig and M. G. Ries and A. N. Wenz and G Zürn and S Jochim and T Enss},
url = {https://link.aps.org/doi/10.1103/PhysRevLett.116.045303},
doi = {10.1103/PhysRevLett.116.045303},
year = {2016},
date = {2016-01-01},
urldate = {2016-01-01},
journal = {Physical Review Letters},
volume = {116},
number = {4},
pages = {45303},
note = {Publisher: American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2015
Murmann S, Deuretzbacher F, Zürn G, Bjerlin J, Reimann S M, Santos L, Lompe T, Jochim S
Antiferromagnetic Heisenberg Spin Chain of a Few Cold Atoms in a One-Dimensional Trap Journal Article
In: Physical Review Letters, vol. 115, no. 21, pp. 215301, 2015, ISSN: 0031-9007.
@article{Murmann2015a,
title = {Antiferromagnetic Heisenberg Spin Chain of a Few Cold Atoms in a One-Dimensional Trap},
author = {S. Murmann and F. Deuretzbacher and G. Zürn and J. Bjerlin and S. M. Reimann and L. Santos and T. Lompe and S. Jochim},
url = {http://link.aps.org/doi/10.1103/PhysRevLett.115.215301},
doi = {10.1103/PhysRevLett.115.215301},
issn = {0031-9007},
year = {2015},
date = {2015-11-01},
urldate = {2015-11-01},
journal = {Physical Review Letters},
volume = {115},
number = {21},
pages = {215301},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Murthy P A, Boettcher I, Bayha L, Holzmann M, Kedar D, Neidig M, Ries M G, Wenz A N, Zürn G, Jochim S
Observation of the Berezinskii-Kosterlitz-Thouless Phase Transition in an Ultracold Fermi Gas. Journal Article
In: Physical review letters, vol. 115, no. 1, pp. 010401, 2015, ISSN: 1079-7114.
@article{Murthy2015,
title = {Observation of the Berezinskii-Kosterlitz-Thouless Phase Transition in an Ultracold Fermi Gas.},
author = {P A Murthy and I Boettcher and L Bayha and M Holzmann and D Kedar and M Neidig and M G Ries and A N Wenz and G Zürn and S Jochim},
url = {http://www.ncbi.nlm.nih.gov/pubmed/26182082},
doi = {10.1103/PhysRevLett.115.010401},
issn = {1079-7114},
year = {2015},
date = {2015-07-01},
urldate = {2015-07-01},
journal = {Physical review letters},
volume = {115},
number = {1},
pages = {010401},
abstract = {We experimentally investigate the first-order correlation function of a trapped Fermi gas in the two-dimensional BEC-BCS crossover. We observe a transition to a low-temperature superfluid phase with algebraically decaying correlations. We show that the spatial coherence of the entire trapped system can be characterized by a single temperature-dependent exponent. We find the exponent at the transition to be constant over a wide range of interaction strengths across the crossover. This suggests that the phase transitions in both the bosonic regime and the strongly interacting crossover regime are of Berezinskii-Kosterlitz-Thouless type and lie within the same universality class. On the bosonic side of the crossover, our data are well described by the quantum Monte Carlo calculations for a Bose gas. In contrast, in the strongly interacting regime, we observe a superfluid phase which is significantly influenced by the fermionic nature of the constituent particles.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We experimentally investigate the first-order correlation function of a trapped Fermi gas in the two-dimensional BEC-BCS crossover. We observe a transition to a low-temperature superfluid phase with algebraically decaying correlations. We show that the spatial coherence of the entire trapped system can be characterized by a single temperature-dependent exponent. We find the exponent at the transition to be constant over a wide range of interaction strengths across the crossover. This suggests that the phase transitions in both the bosonic regime and the strongly interacting crossover regime are of Berezinskii-Kosterlitz-Thouless type and lie within the same universality class. On the bosonic side of the crossover, our data are well described by the quantum Monte Carlo calculations for a Bose gas. In contrast, in the strongly interacting regime, we observe a superfluid phase which is significantly influenced by the fermionic nature of the constituent particles.
Ries M G, Wenz A N, Zürn G, Bayha L, Boettcher I, Kedar D, Murthy P A, Neidig M, Lompe T, Jochim S
Observation of Pair Condensation in the Quasi-2D BEC-BCS Crossover. Journal Article
In: Physical review letters, vol. 114, no. 23, pp. 230401, 2015, ISSN: 1079-7114.
@article{Ries2015,
title = {Observation of Pair Condensation in the Quasi-2D BEC-BCS Crossover.},
author = {M G Ries and A N Wenz and G Zürn and L Bayha and I Boettcher and D Kedar and P A Murthy and M Neidig and T Lompe and S Jochim},
url = {http://www.ncbi.nlm.nih.gov/pubmed/26196783},
doi = {10.1103/PhysRevLett.114.230401},
issn = {1079-7114},
year = {2015},
date = {2015-06-01},
urldate = {2015-06-01},
journal = {Physical review letters},
volume = {114},
number = {23},
pages = {230401},
abstract = {The condensation of fermion pairs lies at the heart of superfluidity. However, for strongly correlated systems with reduced dimensionality the mechanisms of pairing and condensation are still not fully understood. In our experiment we use ultracold atoms as a generic model system to study the phase transition from a normal to a condensed phase in a strongly interacting quasi-two-dimensional Fermi gas. Using a novel method, we obtain the in situ pair momentum distribution of the strongly interacting system and observe the emergence of a low-momentum condensate at low temperatures. By tuning temperature and interaction strength, we map out the phase diagram of the quasi-2D BEC-BCS crossover.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The condensation of fermion pairs lies at the heart of superfluidity. However, for strongly correlated systems with reduced dimensionality the mechanisms of pairing and condensation are still not fully understood. In our experiment we use ultracold atoms as a generic model system to study the phase transition from a normal to a condensed phase in a strongly interacting quasi-two-dimensional Fermi gas. Using a novel method, we obtain the in situ pair momentum distribution of the strongly interacting system and observe the emergence of a low-momentum condensate at low temperatures. By tuning temperature and interaction strength, we map out the phase diagram of the quasi-2D BEC-BCS crossover.
Murmann S, Bergschneider A, Klinkhamer V M, Zürn G, Lompe T, Jochim S
Two Fermions in a Double Well: Exploring a Fundamental Building Block of the Hubbard Model Journal Article
In: Physical Review Letters, vol. 114, no. 8, pp. 80402, 2015, (Publisher: American Physical Society).
@article{Murmann2015,
title = {Two Fermions in a Double Well: Exploring a Fundamental Building Block of the Hubbard Model},
author = {Simon Murmann and Andrea Bergschneider and Vincent M Klinkhamer and Gerhard Zürn and Thomas Lompe and Selim Jochim},
url = {https://link.aps.org/doi/10.1103/PhysRevLett.114.080402},
doi = {10.1103/PhysRevLett.114.080402},
year = {2015},
date = {2015-02-01},
urldate = {2015-02-01},
journal = {Physical Review Letters},
volume = {114},
number = {8},
pages = {80402},
note = {Publisher: American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Ries M G, Wenz A N, Zürn G, Bayha L, Boettcher I, Kedar D, Murthy P, Neidig M, Lompe T, Jochim S
Observation of Pair Condensation in the Quasi-2D BEC-BCS Crossover Journal Article
In: Physical Review Letters, vol. 114, no. 23, pp. 230401, 2015.
@article{Ries2015a,
title = {Observation of Pair Condensation in the Quasi-2D BEC-BCS Crossover},
author = {M. G. Ries and A. N. Wenz and G. Zürn and L. Bayha and I. Boettcher and D. Kedar and P. Murthy and M. Neidig and T. Lompe and S. Jochim},
url = {http://link.aps.org/doi/10.1103/PhysRevLett.114.230401},
year = {2015},
date = {2015-01-01},
urldate = {2015-01-01},
journal = {Physical Review Letters},
volume = {114},
number = {23},
pages = {230401},
abstract = {The condensation of fermion pairs lies at the heart of superfluidity. However, for strongly correlated systems with reduced dimensionality the mechanisms of pairing and condensation are still not fully understood. In our experiment we use ultracold atoms as a generic model system to study the phase transition from a normal to a condensed phase in a strongly interacting quasi-two-dimensional Fermi gas. Using a novel method, we obtain the in situ pair momentum distribution of the strongly interacting system and observe the emergence of a low-momentum condensate at low temperatures. By tuning temperature and interaction strength, we map out the phase diagram of the quasi-2D BEC-BCS crossover.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The condensation of fermion pairs lies at the heart of superfluidity. However, for strongly correlated systems with reduced dimensionality the mechanisms of pairing and condensation are still not fully understood. In our experiment we use ultracold atoms as a generic model system to study the phase transition from a normal to a condensed phase in a strongly interacting quasi-two-dimensional Fermi gas. Using a novel method, we obtain the in situ pair momentum distribution of the strongly interacting system and observe the emergence of a low-momentum condensate at low temperatures. By tuning temperature and interaction strength, we map out the phase diagram of the quasi-2D BEC-BCS crossover.
2014
Murthy P A, Kedar D, Lompe T, Neidig M, Ries M G, Wenz A N, Zürn G, Jochim S
Matter-wave Fourier optics with a strongly interacting two-dimensional Fermi gas Journal Article
In: Physical Review A, vol. 90, no. 4, pp. 043611, 2014, (Publisher: American Physical Society).
@article{murthy_matter-wave_2014,
title = {Matter-wave Fourier optics with a strongly interacting two-dimensional Fermi gas},
author = {P. A. Murthy and D. Kedar and T. Lompe and M. Neidig and M. G. Ries and A. N. Wenz and G. Zürn and S. Jochim},
url = {https://link.aps.org/doi/10.1103/PhysRevA.90.043611},
doi = {10.1103/PhysRevA.90.043611},
year = {2014},
date = {2014-10-01},
urldate = {2014-10-01},
journal = {Physical Review A},
volume = {90},
number = {4},
pages = {043611},
abstract = {We demonstrate and characterize an experimental technique to directly image the momentum distribution of a strongly interacting two-dimensional quantum gas with high momentum resolution. We apply the principles of Fourier optics to investigate three main operations on the expanding gas: focusing, collimation, and magnification. We focus the gas in the radial plane using a harmonic confining potential and thus gain access to the momentum distribution. We pulse a different harmonic potential to stop the rapid axial expansion, which allows us to image the momentum distribution with high resolution. Additionally, we propose a method to magnify the mapped momentum distribution to access interesting momentum scales. All these techniques can be applied to a wide range of experiments, and in particular to study many-body phases of quantum gases.},
note = {Publisher: American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We demonstrate and characterize an experimental technique to directly image the momentum distribution of a strongly interacting two-dimensional quantum gas with high momentum resolution. We apply the principles of Fourier optics to investigate three main operations on the expanding gas: focusing, collimation, and magnification. We focus the gas in the radial plane using a harmonic confining potential and thus gain access to the momentum distribution. We pulse a different harmonic potential to stop the rapid axial expansion, which allows us to image the momentum distribution with high resolution. Additionally, we propose a method to magnify the mapped momentum distribution to access interesting momentum scales. All these techniques can be applied to a wide range of experiments, and in particular to study many-body phases of quantum gases.
Murthy P A, Kedar D, Lompe T, Neidig M, Ries M G, Wenz A N, Zürn G, Jochim S
Matter-wave Fourier optics with a strongly interacting two-dimensional Fermi gas Journal Article
In: Physical Review A, vol. 90, no. 4, pp. 43611, 2014, (Publisher: American Physical Society).
@article{Murthy2014,
title = {Matter-wave Fourier optics with a strongly interacting two-dimensional Fermi gas},
author = {P A Murthy and D Kedar and T Lompe and M Neidig and M G Ries and A N Wenz and G Zürn and S Jochim},
url = {https://link.aps.org/doi/10.1103/PhysRevA.90.043611},
doi = {10.1103/PhysRevA.90.043611},
year = {2014},
date = {2014-10-01},
urldate = {2014-10-01},
journal = {Physical Review A},
volume = {90},
number = {4},
pages = {43611},
note = {Publisher: American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2013
Sala S, Zürn G, Lompe T, Wenz A N, Murmann S, Serwane F, Jochim S, Saenz A
Coherent molecule formation in anharmonic potentials near confinement-induced resonances. Journal Article
In: Physical review letters, vol. 110, no. 20, pp. 203202, 2013, ISSN: 1079-7114.
@article{Sala2013,
title = {Coherent molecule formation in anharmonic potentials near confinement-induced resonances.},
author = {S Sala and G Zürn and T Lompe and A N Wenz and S Murmann and F Serwane and S Jochim and A Saenz},
url = {http://www.ncbi.nlm.nih.gov/pubmed/25167405},
doi = {10.1103/PhysRevLett.110.203202},
issn = {1079-7114},
year = {2013},
date = {2013-05-01},
urldate = {2013-05-01},
journal = {Physical review letters},
volume = {110},
number = {20},
pages = {203202},
abstract = {We perform a theoretical and experimental study of a system of two ultracold atoms with tunable interaction in an elongated trapping potential. We show that the coupling of center-of-mass and relative motion due to an anharmonicity of the trapping potential leads to a coherent coupling of a state of an unbound atom pair and a molecule with a center of mass excitation. By performing the experiment with exactly two particles we exclude three-body losses and can therefore directly observe coherent molecule formation. We find quantitative agreement between our theory of inelastic confinement-induced resonances and the experimental results. This shows that the effects of center-of-mass to relative-motion coupling can have a significant impact on the physics of quantum systems near center-of-mass to relative-motion coupling resonances.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We perform a theoretical and experimental study of a system of two ultracold atoms with tunable interaction in an elongated trapping potential. We show that the coupling of center-of-mass and relative motion due to an anharmonicity of the trapping potential leads to a coherent coupling of a state of an unbound atom pair and a molecule with a center of mass excitation. By performing the experiment with exactly two particles we exclude three-body losses and can therefore directly observe coherent molecule formation. We find quantitative agreement between our theory of inelastic confinement-induced resonances and the experimental results. This shows that the effects of center-of-mass to relative-motion coupling can have a significant impact on the physics of quantum systems near center-of-mass to relative-motion coupling resonances.
Zürn G, Wenz N, Murmann S, Bergschneider A, Lompe T, Jochim S
Pairing in few-fermion systems with attractive interactions Journal Article
In: Physical Review Letters, vol. 111, no. 17, pp. 36–38, 2013, ISSN: 00319007, (arXiv: 1307.5153).
@article{Zurn2013,
title = {Pairing in few-fermion systems with attractive interactions},
author = {G. Zürn and N. Wenz and S. Murmann and A. Bergschneider and T. Lompe and S. Jochim},
doi = {10.1103/PhysRevLett.111.175302},
issn = {00319007},
year = {2013},
date = {2013-01-01},
urldate = {2013-01-01},
journal = {Physical Review Letters},
volume = {111},
number = {17},
pages = {36--38},
abstract = {We have studied quasi one-dimensional few-particle systems consisting of one to six ultracold fermionic atoms in two different spin states with attractive interactions. We probe the system by deforming the trapping potential and by observing the tunneling of particles out of the trap. For even particle numbers we observe a tunneling behavior which deviates from uncorrelated single-particle tunneling indicating the existence of pair correlations in the system. From the tunneling timescales of the systems we infer the single particle dissociation energies for different particle numbers which show a strong odd-even effect, similar to the one observed for neutron separation experiments in nuclei.},
note = {arXiv: 1307.5153},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We have studied quasi one-dimensional few-particle systems consisting of one to six ultracold fermionic atoms in two different spin states with attractive interactions. We probe the system by deforming the trapping potential and by observing the tunneling of particles out of the trap. For even particle numbers we observe a tunneling behavior which deviates from uncorrelated single-particle tunneling indicating the existence of pair correlations in the system. From the tunneling timescales of the systems we infer the single particle dissociation energies for different particle numbers which show a strong odd-even effect, similar to the one observed for neutron separation experiments in nuclei.
Zürn G, Lompe T, Wenz N, Jochim S, Julienne P S, Hutson J M
Precise characterization of Li6 Feshbach resonances using trap-sideband-resolved RF spectroscopy of weakly bound molecules Journal Article
In: Physical Review Letters, vol. 110, no. 13, pp. 1–5, 2013, ISSN: 00319007, (arXiv: 1211.1512v2).
@article{Zurn2013a,
title = {Precise characterization of Li6 Feshbach resonances using trap-sideband-resolved RF spectroscopy of weakly bound molecules},
author = {G. Zürn and T. Lompe and N. Wenz and S. Jochim and P. S. Julienne and J. M. Hutson},
doi = {10.1103/PhysRevLett.110.135301},
issn = {00319007},
year = {2013},
date = {2013-01-01},
urldate = {2013-01-01},
journal = {Physical Review Letters},
volume = {110},
number = {13},
pages = {1--5},
abstract = {We have performed radio-frequency dissociation spectroscopy of weakly bound textasciicircum6Li_2 Feshbach molecules using low-density samples of about 30 molecules in an optical dipole trap. Combined with a high magnetic field stability this allows us to resolve the discrete trap levels in the RF dissociation spectra. This novel technique allows the binding energy of Feshbach molecules to be determined with unprecedented precision. We use these measurements as an input for a fit to the textasciicircum6Li scattering potential using coupled-channel calculations. From this new potential, we determine the pole positions of the broad textasciicircum6Li Feshbach resonances with an accuracy better than 7 textbackslashtimes 10textasciicircum-4 of the resonance widths. This eliminates the dominant uncertainty for current precision measurements of the equation of state of strongly interacting Fermi gases. For example, our results imply a corrected value for the Bertsch parameter textbackslashxi measured by Ku et al. [Science 335, 563 (2012)], which is textbackslashxi = 0.370(5)(8).},
note = {arXiv: 1211.1512v2},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We have performed radio-frequency dissociation spectroscopy of weakly bound textasciicircum6Li_2 Feshbach molecules using low-density samples of about 30 molecules in an optical dipole trap. Combined with a high magnetic field stability this allows us to resolve the discrete trap levels in the RF dissociation spectra. This novel technique allows the binding energy of Feshbach molecules to be determined with unprecedented precision. We use these measurements as an input for a fit to the textasciicircum6Li scattering potential using coupled-channel calculations. From this new potential, we determine the pole positions of the broad textasciicircum6Li Feshbach resonances with an accuracy better than 7 textbackslashtimes 10textasciicircum-4 of the resonance widths. This eliminates the dominant uncertainty for current precision measurements of the equation of state of strongly interacting Fermi gases. For example, our results imply a corrected value for the Bertsch parameter textbackslashxi measured by Ku et al. [Science 335, 563 (2012)], which is textbackslashxi = 0.370(5)(8).
Wenz A N, Zürn G, Murmann S, Brouzos I, Lompe T, Jochim S
From Few to Many: Observing the Formation of a Fermi Sea One Atom at a Time Journal Article
In: Science, vol. 342, no. 6157, pp. 457–460, 2013, ISSN: 0036-8075, 1095-9203, (arXiv: 1307.3443v2 ISBN: 9781597820738).
@article{Wenz2013,
title = {From Few to Many: Observing the Formation of a Fermi Sea One Atom at a Time},
author = {A. N. Wenz and G. Zürn and S. Murmann and I. Brouzos and T. Lompe and S. Jochim},
url = {http://www.sciencemag.org/content/342/6157/457%5Cnhttp://www.ncbi.nlm.nih.gov/pubmed/24159041},
doi = {10.1126/science.1240516},
issn = {0036-8075, 1095-9203},
year = {2013},
date = {2013-01-01},
urldate = {2013-01-01},
journal = {Science},
volume = {342},
number = {6157},
pages = {457--460},
abstract = {Knowing when a physical system has reached sufficient size for its macroscopic properties to be well described by many-body theory is difficult. We investigated the crossover from few- to many-body physics by studying quasi–one-dimensional systems of ultracold atoms consisting of a single impurity interacting with an increasing number of identical fermions. We measured the interaction energy of such a system as a function of the number of majority atoms for different strengths of the interparticle interaction. As we increased the number of majority atoms one by one, we observed fast convergence of the normalized interaction energy toward a many-body limit calculated for a single impurity immersed in a Fermi sea of majority particles.textbackslashnNot Very ManytextbackslashnIn physics, the behavior of a system sometimes becomes easier to grasp when the number of particles is large and statistics begin to matter, but knowing how large the system needs to be for that to happen is a challenging computational problem. Wenz et al. (p. 457) used a one-dimensional trapped gas of 6Li atoms to study this crossover from few to many. To simplify the problem, they worked with one “impurity” atom that was in a state unlike the other—“majority”—atoms. For weak and intermediate interactions, the system approached the many-body limit with as few as four majority atoms.},
note = {arXiv: 1307.3443v2
ISBN: 9781597820738},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Knowing when a physical system has reached sufficient size for its macroscopic properties to be well described by many-body theory is difficult. We investigated the crossover from few- to many-body physics by studying quasi–one-dimensional systems of ultracold atoms consisting of a single impurity interacting with an increasing number of identical fermions. We measured the interaction energy of such a system as a function of the number of majority atoms for different strengths of the interparticle interaction. As we increased the number of majority atoms one by one, we observed fast convergence of the normalized interaction energy toward a many-body limit calculated for a single impurity immersed in a Fermi sea of majority particles.textbackslashnNot Very ManytextbackslashnIn physics, the behavior of a system sometimes becomes easier to grasp when the number of particles is large and statistics begin to matter, but knowing how large the system needs to be for that to happen is a challenging computational problem. Wenz et al. (p. 457) used a one-dimensional trapped gas of 6Li atoms to study this crossover from few to many. To simplify the problem, they worked with one “impurity” atom that was in a state unlike the other—“majority”—atoms. For weak and intermediate interactions, the system approached the many-body limit with as few as four majority atoms.
2012
Zürn G, Serwane F, Lompe T, Wenz A N, Ries M G, Bohn J E, Jochim S
Fermionization of two distinguishable fermions. Journal Article
In: Physical review letters, vol. 108, no. 7, pp. 075303, 2012, ISSN: 1079-7114.
@article{Zurn2012,
title = {Fermionization of two distinguishable fermions.},
author = {G Zürn and F Serwane and T Lompe and A N Wenz and M G Ries and J E Bohn and S Jochim},
url = {http://www.ncbi.nlm.nih.gov/pubmed/22401221},
doi = {10.1103/PhysRevLett.108.075303},
issn = {1079-7114},
year = {2012},
date = {2012-02-01},
urldate = {2012-02-01},
journal = {Physical review letters},
volume = {108},
number = {7},
pages = {075303},
abstract = {We study a system of two distinguishable fermions in a 1D harmonic potential. This system has the exceptional property that there is an analytic solution for arbitrary values of the interparticle interaction. We tune the interaction strength and compare the measured properties of the system to the theoretical prediction. For diverging interaction strength, the energy and square modulus of the wave function for two distinguishable particles are the same as for a system of two noninteracting identical fermions. This is referred to as fermionization. We have observed this phenomenon by directly comparing two distinguishable fermions with diverging interaction strength with two identical fermions in the same potential. We observe good agreement between experiment and theory. By adding more particles our system can be used as a quantum simulator for more complex systems where no theoretical solution is available.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We study a system of two distinguishable fermions in a 1D harmonic potential. This system has the exceptional property that there is an analytic solution for arbitrary values of the interparticle interaction. We tune the interaction strength and compare the measured properties of the system to the theoretical prediction. For diverging interaction strength, the energy and square modulus of the wave function for two distinguishable particles are the same as for a system of two noninteracting identical fermions. This is referred to as fermionization. We have observed this phenomenon by directly comparing two distinguishable fermions with diverging interaction strength with two identical fermions in the same potential. We observe good agreement between experiment and theory. By adding more particles our system can be used as a quantum simulator for more complex systems where no theoretical solution is available.
2011
Serwane F, Zurn G, Lompe T, Ottenstein T B, Wenz A N, Jochim S
Deterministic Preparation of a Tunable Few-Fermion System Journal Article
In: Science, vol. 332, no. 6027, pp. 336–338, 2011, ISSN: 1095-9203, (arXiv: 1101.2124 ISBN: 0036-8075, 1095-9203).
@article{Serwane2011,
title = {Deterministic Preparation of a Tunable Few-Fermion System},
author = {F Serwane and G Zurn and T Lompe and T B Ottenstein and A N Wenz and S Jochim},
url = {http://www.sciencemag.org/content/332/6027/336.abstract},
doi = {10.1126/science.1201351},
issn = {1095-9203},
year = {2011},
date = {2011-01-01},
urldate = {2011-01-01},
journal = {Science},
volume = {332},
number = {6027},
pages = {336--338},
abstract = {Systems consisting of few interacting fermions are the building blocks of matter, with atoms and nuclei being the most prominent examples. We have created a few-body quantum system with complete control over its quantum state using ultracold fermionic atoms in an optical dipole trap. Ground-state systems consisting of 1 to 10 particles are prepared with fidelities of ∼90%. We can tune the interparticle interactions to arbitrary values using a Feshbach resonance and have observed the interaction-induced energy shift for a pair of repulsively interacting atoms. This work is expected to enable quantum simulation of strongly correlated few-body systems.},
note = {arXiv: 1101.2124
ISBN: 0036-8075, 1095-9203},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Systems consisting of few interacting fermions are the building blocks of matter, with atoms and nuclei being the most prominent examples. We have created a few-body quantum system with complete control over its quantum state using ultracold fermionic atoms in an optical dipole trap. Ground-state systems consisting of 1 to 10 particles are prepared with fidelities of ∼90%. We can tune the interparticle interactions to arbitrary values using a Feshbach resonance and have observed the interaction-induced energy shift for a pair of repulsively interacting atoms. This work is expected to enable quantum simulation of strongly correlated few-body systems.
2010
Lompe T, Ottenstein T B, Serwane F, Wenz A N, Zürn G, Jochim S
Radio-Frequency Association of Efimov Trimers Journal Article
In: Science, vol. 330, no. 6006, pp. 940 LP – 944, 2010.
@article{Lompe2010,
title = {Radio-Frequency Association of Efimov Trimers},
author = {Thomas Lompe and Timo B Ottenstein and Friedhelm Serwane and Andre N Wenz and Gerhard Zürn and Selim Jochim},
url = {http://science.sciencemag.org/content/330/6006/940.abstract},
year = {2010},
date = {2010-11-01},
urldate = {2010-11-01},
journal = {Science},
volume = {330},
number = {6006},
pages = {940 LP -- 944},
abstract = {The quantum mechanical three-body problem is one of the fundamental challenges of few-body physics. When the two-body interactions become resonant, an infinite series of universal three-body bound states is predicted to occur, whose properties are determined by the strength of the two-body interactions. We used radio-frequency fields to associate Efimov trimers consisting of three distinguishable fermions. The measurements of their binding energy are consistent with theoretical predictions that include nonuniversal corrections.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The quantum mechanical three-body problem is one of the fundamental challenges of few-body physics. When the two-body interactions become resonant, an infinite series of universal three-body bound states is predicted to occur, whose properties are determined by the strength of the two-body interactions. We used radio-frequency fields to associate Efimov trimers consisting of three distinguishable fermions. The measurements of their binding energy are consistent with theoretical predictions that include nonuniversal corrections.
Lompe T, Ottenstein T B, Serwane F, Viering K, Wenz A N, Zürn G, Jochim S
Atom-dimer scattering in a three-component fermi gas Journal Article
In: Physical Review Letters, vol. 105, no. 10, pp. 1–5, 2010, ISSN: 00319007, (arXiv: 1003.0600).
@article{Lompe2010a,
title = {Atom-dimer scattering in a three-component fermi gas},
author = {T Lompe and T B Ottenstein and F Serwane and K Viering and A N Wenz and G. Zürn and S Jochim},
doi = {10.1103/PhysRevLett.105.103201},
issn = {00319007},
year = {2010},
date = {2010-01-01},
urldate = {2010-01-01},
journal = {Physical Review Letters},
volume = {105},
number = {10},
pages = {1--5},
abstract = {Ultracold gases of three distinguishable particles with large scattering lengths are expected to show rich few-body physics related to the Efimov effect. We have created three different mixtures of ultracold 6Li atoms and weakly bound 6Li2 dimers consisting of atoms in three different hyperfine states and studied their inelastic decay via atom-dimer collisions. We have found resonant enhancement of the decay due to the crossing of Efimov-like trimer states with the atom-dimer continuum in one mixture as well as minima of the decay in another mixture, which we interpret as a suppression of exchange reactions of the type textbar12+textbar3→textbar23+textbar1. Such a suppression is caused by interference between different decay paths and demonstrates the possibility of using Efimov physics to control the rate constants for molecular exchange reactions in the ultracold regime.},
note = {arXiv: 1003.0600},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Ultracold gases of three distinguishable particles with large scattering lengths are expected to show rich few-body physics related to the Efimov effect. We have created three different mixtures of ultracold 6Li atoms and weakly bound 6Li2 dimers consisting of atoms in three different hyperfine states and studied their inelastic decay via atom-dimer collisions. We have found resonant enhancement of the decay due to the crossing of Efimov-like trimer states with the atom-dimer continuum in one mixture as well as minima of the decay in another mixture, which we interpret as a suppression of exchange reactions of the type textbar12+textbar3→textbar23+textbar1. Such a suppression is caused by interference between different decay paths and demonstrates the possibility of using Efimov physics to control the rate constants for molecular exchange reactions in the ultracold regime.
2009
Wenz A N, Lompe T, Ottenstein T B, Serwane F, Zürn G, Jochim S
Universal trimer in a three-component Fermi gas Journal Article
In: Physical Review A, vol. 80, no. 4, pp. 040702, 2009, ISSN: 1050-2947, (arXiv: 0906.4378).
@article{Wenz2009,
title = {Universal trimer in a three-component Fermi gas},
author = {A. N. Wenz and T. Lompe and T. B. Ottenstein and F. Serwane and G. Zürn and S. Jochim},
url = {http://link.aps.org/doi/10.1103/PhysRevA.80.040702},
doi = {10.1103/PhysRevA.80.040702},
issn = {1050-2947},
year = {2009},
date = {2009-01-01},
urldate = {2009-01-01},
journal = {Physical Review A},
volume = {80},
number = {4},
pages = {040702},
abstract = {We show that the recently measured magnetic field dependence of three-body loss in a three-component mixture of ultracold $textasciicircum6$Li atoms [1,2] can be explained by the presence of a universal trimer state. Previous work suggested a universal trimer state as a probable explanation, yet failed to get good agreement between theory and experiment over the whole range of magnetic fields. For our description we adapt the theory of Braaten and Hammer [3] for three identical bosons to the case of three distinguishable fermions by combining the three scattering lengths $a_12,$ $a_23$ and $a_13$ between the three components to an effective interaction parameter $a_m$. We show that taking into account a magnetic field variation of the lifetime of the trimer state is essential to obtain a complete understanding of the observed decay rates.},
note = {arXiv: 0906.4378},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We show that the recently measured magnetic field dependence of three-body loss in a three-component mixture of ultracold $textasciicircum6$Li atoms [1,2] can be explained by the presence of a universal trimer state. Previous work suggested a universal trimer state as a probable explanation, yet failed to get good agreement between theory and experiment over the whole range of magnetic fields. For our description we adapt the theory of Braaten and Hammer [3] for three identical bosons to the case of three distinguishable fermions by combining the three scattering lengths $a_12,$ $a_23$ and $a_13$ between the three components to an effective interaction parameter $a_m$. We show that taking into account a magnetic field variation of the lifetime of the trimer state is essential to obtain a complete understanding of the observed decay rates.