Stability of quantum degenerate Fermi gases of tilted polar molecules

Abstract

A recent experimental realization of quantum degenerate gas of ${}^{40}$K${}^{87}$Rb molecules opens up prospects of exploring strong dipolar Fermi gases and many-body phenomena arising in that regime. Here we derive a mean-field variational approach based on the Wigner function for the description of ground-state properties of such systems. We show that the stability of dipolar fermions in a general harmonic trap is universal as it only depends on the trap aspect ratios and the dipoles' orientation. We calculate the species-independent stability diagram and the deformation of the Fermi surface (FS) for polarized molecules, whose electric dipoles are oriented along a preferential direction. Compared to atomic magnetic species, the stability of a molecular electric system turns out to strongly depend on its geometry and the FS deformation significantly increases.

6 + 5 pages, 5 + 3 figures; accepted for publication in Phys. Rev. Research

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Cited by in corpus (3)

• Evaporation of microwave-shielded polar molecules to quantum degeneracy
• Transition from a polaronic condensate to a degenerate Fermi gas of heteronuclear molecules
• Interplay between shell structure and trap deformation in dipolar fermi gases