Finite Temperature Phase Diagram of Quasi-Two-Dimensional Imbalanced Fermi Gases Beyond Mean-Field

TL;DR

This paper explores the superfluid transition temperature in quasi-two-dimensional imbalanced Fermi gases, revealing significant suppression effects beyond mean-field theory, especially with increased binding energy and imbalance.

Contribution

It introduces a beyond-mean-field analysis of the superfluid transition, accounting for second-order interaction effects in imbalanced Fermi gases.

Findings

Transition temperature in balanced systems is suppressed by a factor of approximately 2.72.

Imbalance and increased binding energy significantly reduce the tricritical point's polarization and temperature.

Second-order interactions play a crucial role in accurately describing the phase diagram.

Abstract

We investigate the superfluid transition temperature of quasi-two-dimensional imbalanced Fermi gases beyond the mean-field approximation, through the second-order (or induced) interaction effects. For a balanced Fermi system the transition temperature is suppressed by a factor $\approx 2.72$. For imbalanced Fermi systems, the polarization and transition temperature of the tricritical point are significantly reduced as the two-body binding energy $|\epsilon_B|$ increases.