Two-dimensional spin-imbalanced Fermi gases at non-zero temperature: Phase separation of a non-condensate

Abstract

We study a trapped two-dimensional spin-imbalanced Fermi gas over a range of temperatures. In the moderate temperature regime, associated with current experiments, we find reasonable semi-quantitative agreement with the measured density profiles as functions of varying spin imbalance and interaction strength. Our calculations show that, in contrast to the three-dimensional case, the phase separation which appears as a spin balanced core, can be associated with non-condensed fermion pairs. We present predictions at lower temperatures where a quasi-condensate will first appear, based on the pair momentum distribution and following the protocols of Jochim and collaborators. While these profiles also indicate phase separation, they exhibit distinctive features which may aid in identifying the condensation regime.

4 pages, 4 figure

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Cited by in corpus (2)

• Exotic superfluidity and pairing phenomena in atomic Fermi gases in mixed dimensions
• Dimensional crossover in ultracold Fermi gases from Functional Renormalisation