Expansion of a Superfluid Fermi Gas Monolayer
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A monolayer of superfluid Fermi gas can be prepared within an optical dipole trap using the tight confinement along the chosen direction. In this case, Cooper pairs occupy the lowest state corresponding to the motion in the trapping potential. After switching off the trapping potential, the initially two-dimensional gas expands to the three-dimensional space. In the case of unitary s-wave interactions, the dynamics of Fermi gas expansion is treated in the framework of appropriately modified Gross–Pitaevskii equation. It is found that the superfluid gas expands significantly faster than the normal gas, in contrast to the situation characteristic of the initially three-dimensional gas. The available experimental data [P. Dyke et al., Phys. Rev. A 93, 011603 (2016)] are close to the predictions of the model under study.
We are grateful to Igor Boettcher, Selim Jochim, and Puneet Murthy for helpful discussions. The work of A.V.T. was supported by the Presidium of the Russian Academy of Sciences, program “Nonlinear dynamics: basic problems and applications.” The work of M.Yu.K was supported by the Russian Science Foundation, project no. 18-12-00002.