Trapped $^{6}$Li : A high T_c superfluid ?

TL;DR

This paper investigates how density fluctuation-induced interactions can significantly enhance the critical temperature of superfluid $^{6}$Li, indicating a potential high-temperature superfluid phase.

Contribution

It introduces a strong coupling equation considering density fluctuation effects and demonstrates their impact on increasing the superfluid transition temperature.

Findings

Density fluctuations lead to a strong increase in critical temperature near instability.

The derived equation captures fluctuation-induced interactions in superfluid $^{6}$Li.

Signatures of fluctuation effects are evident in the critical temperature behavior.

Abstract

We consider the effect of the indirect interaction due to the exchange of density fluctuations on the critical temperature of superfluid $^{6}$Li . We obtain the strong coupling equation giving this critical temperature. This equation is solved approximately by retaining the same set of diagrams as in the paramagnon model. We show that, near the instability threshold, the attractive interaction due to density fluctuations gives rise to a strong increase in the critical temperature, providing a clear signature of the existence of fluctuation induced interactions.