Superfluid transition in disordered dipolar Fermi gases

TL;DR

This paper explores how disorder can enhance the superfluid transition temperature in a two-dimensional dipolar Fermi gas, challenging traditional views and opening new experimental possibilities.

Contribution

It demonstrates that disorder can significantly increase the critical temperature in a 2D dipolar Fermi gas, contrary to the Anderson theorem.

Findings

Disorder can raise the superfluid transition temperature up to 10 nK.

Momentum-dependent dipole-dipole interactions violate the Anderson theorem.

Potential for experimental observation of superfluidity in weakly interacting Fermi gases.

Abstract

We consider a weakly interacting two-component Fermi gas of dipolar particles (magnetic atoms or polar molecules) in the two-dimensional geometry. The dipole-dipole interaction (together with the short-range interaction at Feshbach resonances) for dipoles perpendicular to the plane of translational motion may provide a superfluid transition. The dipole-dipole scattering amplitude is momentum dependent, which violates the Anderson theorem claiming the independence of the transition temperature on the presence of weak disorder. We have shown that the disorder can strongly increase the critical temperature (up to 10 nK at realistic densities). This opens wide possibilities for the studies of the superfluid regime in weakly interacting Fermi gases, which was not observed so far.