Superfluid density and critical velocity near the Berezinskii-Kosterlitz-Thouless transition in a two-dimensional strongly interacting Fermi gas

Brendan C. Mulkerin, Lianyi He, Paul Dyke, Chris J. Vale, Xia Ji Liu, Hui Hu

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30 Citations (Scopus)

Abstract

We theoretically investigate superfluidity in a strongly interacting Fermi gas confined to two dimensions at finite temperature. Using a Gaussian pair fluctuation theory in the superfluid phase, we calculate the superfluid density and determine the critical temperature and chemical potential at the Berezinskii-Kosterlitz-Thouless transition. We propose that the transition can be unambiguously demonstrated in cold-atom experiments by stirring the superfluid Fermi gas using a red-detuned laser beam, to identify the characteristic jump in the local Landau critical velocity at the superfluid-normal interface, as the laser beam moves across the cloud.

Original languageEnglish
Article number053608
Number of pages7
JournalPhysical Review A
Volume96
Issue number5
DOIs
Publication statusPublished - 6 Nov 2017
Externally publishedYes

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