Induced p-wave superfluidity in strongly interacting imbalanced Fermi gases

TL;DR

This paper predicts that induced interactions in strongly imbalanced Fermi gases can lead to a p-wave superfluid transition at low temperatures, especially in the strongly interacting regime, providing a new pathway for superfluidity.

Contribution

It introduces a calculation of induced interactions causing p-wave superfluidity in imbalanced Fermi gases, highlighting the transition's experimental feasibility.

Findings

Induced interactions cause instability towards p-wave superfluidity.

Transition temperature is accessible in the strongly interacting regime.

The superfluid state emerges from the polaron Fermi liquid phase.

Abstract

The induced interaction among the majority spin species, due to the presence of the minority species, is computed for the case of a population-imbalanced resonantly-interacting Fermi gas. It is shown that this interaction leads to an instability, at low temperatures, of the recently observed polaron Fermi liquid phase of strongly imbalanced Fermi gases to a p-wave superfluid state. We find that the associated transition temperature, while quite small in the weakly interacting BCS regime, is experimentally accessible in the strongly interacting unitary regime.