Renormalization group approach to the normal phase of 2D Fermi gases

TL;DR

This paper employs a renormalization group approach combined with perturbation theory to analyze the properties of 2D Fermi gases in the normal phase, providing theoretical results that align with recent experimental measurements.

Contribution

It introduces a novel combination of RG and perturbation theory to study 2D Fermi gases, offering new insights into their equation of state and compressibility in the normal phase.

Findings

Good agreement with experimental measurements of the equation of state.

Logarithmic corrections are significant in the equation of state.

The approach accurately describes the normal phase properties of 2D Fermi gases.

Abstract

We present results on the effect of short-range, attractive interactions on the properties of balanced 2D Fermi gases in the non-superfluid (normal) phase. Our approach combines the renormalization group (RG) with perturbation theory, yielding observables such as the equation of state and compressibility. We find good agreement with recent experiments that measured the equation of state in trapped gases in the balanced regime, showing that these results are consistent with logarithmic corrections in the equation of state.