Single particle spectrum of resonant population imbalanced Fermi gases

TL;DR

This paper uses a T-matrix approximation to analyze the single particle spectrum of a low-temperature, resonant, population-imbalanced Fermi gas, revealing a double-peaked spectral feature in the strongly interacting regime.

Contribution

It introduces a detailed calculation of the single particle spectrum in polarized Fermi gases using the T-matrix approach, highlighting the emergence of a double-peaked spectral structure.

Findings

Spectrum splits into two branches in the strongly interacting regime

Double-peaked radiofrequency spectral feature observed

Provides insights into the normal state of polarized Fermi gases

Abstract

We use a T-matrix approximation to calculate the single particle spectrum of the normal state of a gas of Fermionic atoms at low temperature. In the strongly interacting regime of the polarized gas, we find that the spectrum is separated in two branches, leading to a double-peaked radiofrequency spectral feature.