Induced P-wave superfluidity within full energy-momentum dependent Eliashberg approximation in asymmetric dilute Fermi gases

TL;DR

This paper investigates P-wave superfluidity in asymmetric dilute Fermi gases, emphasizing the importance of full energy-momentum dependence in Eliashberg calculations to accurately predict pairing gaps.

Contribution

It introduces a comprehensive approach to compute P-wave pairing gaps considering full energy-momentum dependence, revealing larger gaps than simpler approximations.

Findings

Full momentum-energy treatment yields significantly larger pairing gaps.

Retardation effects are crucial for accurate superfluidity predictions.

The results suggest experimental observability of the exotic P-wave paired phase.

Abstract

We consider a very asymmetric system of Fermions with an interaction characterized by a positive scattering length only. The minority atoms pair and form a BEC of dimers, while the surplus fermions interact only indirectly through the exchange of Bogoliubov sound modes. This interaction has a finite range, the retardation effects are significant and the surplus fermions will form a P-wave superfluid. We compute the P-wave pairing gap in the BCS and Eliashberg with only energy dependence approximations, and demonstrate their inadequacy in comparison with a full treatment of the momentum and energy dependence of the induced interaction. The pairing gap computed with a full momentum and energy dependence is significantly larger in magnitude and that makes it more likely that this new exotic paired phase could be put in evidence in atomic trap experiments.