Fermi polarons in two dimensions

TL;DR

This paper theoretically investigates Fermi polarons in two-dimensional systems, analyzing rf spectroscopy to identify attractive and repulsive polarons, and suggests experimental observation of the attractive polaron.

Contribution

It provides a theoretical framework for understanding Fermi polarons in 2D and connects findings to recent experimental results.

Findings

Identification of attractive and repulsive polarons in 2D

Theoretical support for experimental observation of attractive polaron

Analysis of rf spectra features in 2D Fermi gases

Abstract

We theoretically analyze inverse radiofrequency (rf) spectroscopy experiments in two-component Fermi gases. We consider a small number of impurity atoms interacting strongly with a bath of majority atoms. In two-dimensional geometries we find that the main features of the rf spectrum correspond to an attractive polaron and a metastable repulsive polaron. Our results suggest that the attractive polaron has been observed in a recent experiment [Phys. Rev. Lett. 106, 105301 (2011)].