Ultra high temperature superfluidity in ultracold atomic Fermi gases with mixed dimensionality

TL;DR

This paper proposes a method to achieve ultra high temperature superfluidity in ultracold atomic Fermi gases by using mixed dimensionality, significantly surpassing traditional superfluid transition temperatures.

Contribution

Introducing mixed dimensionality in atomic Fermi gases to dramatically increase the superfluid transition temperature beyond known limits.

Findings

Superfluid transition temperature can be effectively raised using mixed dimensionality.

Tuning lattice spacing and trap depth enhances Fermi level and pairing.

Superfluidity may occur at temperatures beyond quantum degeneracy regime.

Abstract

Achieving a higher superfluid transition $T_c$ has been a goal for the fields of superconductivity and atomic Fermi gases. Here we propose that, by using mixed dimensionality, one may achieve ultra high temperature superfluids in two component atomic Fermi gases, where one component feels a regular three-dimensional (3D) continuum space, while the other is subject to a 1D optic lattice potential. Via tuning the lattice spacing and trap depth, one can effectively raise the Fermi level dramatically upon pairing so that superfluidity may occur at an ultra high temperature (in units of Fermi energy) even beyond the quantum degeneracy regime, well surpassing that in an ordinary 3D Fermi gas and all other known superfluids and superconductors.