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Probing and studying homogeneous atomic Fermi gases

Zhenjie Yan, Biswaroop Mukherjee, Parth Patel +7 more

Bulletin of the American Physical SocietyJun 7, 20170 citations

Probing Strongly Interacting Fermi Gases in Homogeneous Potentials

Parth Patel, Zhenjie Yan, Biswaroop Mukherjee +2 more

Bulletin of the American Physical SocietyMay 26, 20160 citations

Strongly interacting homogeneous Fermi gases in two and three dimensions

Cedric Wilson, Biswaroop Mukherjee, Zhenjie Yan +6 more

Bulletin of the American Physical SocietyMay 30, 20180 citations

Two-Dimensional Homogeneous Fermi Gases

Klaus Hueck, Niclas Luick, Lennart Sobirey +3 more

We report on the experimental realization of homogeneous two-dimensional (2D) Fermi gases trapped in a box potential. In contrast to harmonically trapped gases, these homogeneous 2D systems are ideally suited to probe local as well as nonlocal properties of strongly interacting many-body systems. As a first benchmark experiment, we use a local probe to measure the density of a noninteracting 2D Fermi gas as a function of the chemical potential and find excellent agreement with the corresponding equation of state. We then perform matter wave focusing to extract the momentum distribution of the system and directly observe Pauli blocking in a near unity occupation of momentum states. Finally, we measure the momentum distribution of an interacting homogeneous 2D gas in the crossover between attractively interacting fermions and bosonic dimers.We report on the experimental realization of homogeneous two-dimensional (2D) Fermi gases trapped in a box potential. In contrast to harmonically trapped gases, these homogeneous 2D systems are ideally suited to probe local as well as nonlocal properties of strongly interacting many-body systems. As a first benchmark experiment, we use a local probe to measure the density of a noninteracting 2D Fermi gas as a function of the chemical potential and find excellent agreement with the corresponding equation of state. We then perform matter wave focusing to extract the momentum distribution of the system and directly observe Pauli blocking in a near unity occupation of momentum states. Finally, we measure the momentum distribution of an interacting homogeneous 2D gas in the crossover between attractively interacting fermions and bosonic dimers.

arXiv:1704.06315Physical Review LettersFeb 7, 2018161 citations

Two-dimensional Fermi gases

Michael Köhl

Bulletin of the American Physical SocietyJun 6, 20120 citations

Direct observation of the Fermi surface in an ultracold atomic gas

Tara E. Drake, Yoav Sagi, Rabin Paudel +3 more

The ideal (i.e., noninteracting), homogeneous Fermi gas, with its characteristic sharp Fermi surface in the momentum distribution, is a fundamental concept relevant to the behavior of many systems. With trapped Fermi gases of ultracold atoms, one can realize and probe a nearly ideal Fermi gas; however, these systems have a nonuniform density due to the confining potential. We show that the effect of the density variation, which typically washes out any semblance of a Fermi surface step in the momentum distribution, can be mitigated by selectively probing atoms near the center of a trapped gas. With this approach, we have directly measured a Fermi surface in momentum space for a nearly ideal gas, where the average density and temperature of the probed portion of the gas can be determined from the location and sharpness of the Fermi surface.The ideal (i.e., noninteracting), homogeneous Fermi gas, with its characteristic sharp Fermi surface in the momentum distribution, is a fundamental concept relevant to the behavior of many systems. With trapped Fermi gases of ultracold atoms, one can realize and probe a nearly ideal Fermi gas; however, these systems have a nonuniform density due to the confining potential. We show that the effect of the density variation, which typically washes out any semblance of a Fermi surface step in the momentum distribution, can be mitigated by selectively probing atoms near the center of a trapped gas. With this approach, we have directly measured a Fermi surface in momentum space for a nearly ideal gas, where the average density and temperature of the probed portion of the gas can be determined from the location and sharpness of the Fermi surface.

arXiv:1204.0048Physical Review ASep 6, 201226 citations

Probing homogeneous two-dimensional Fermi gases in momentum space

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