Measuring the one-particle excitations of ultracold fermionic atoms by stimulated Raman spectroscopy

TL;DR

This paper introduces a Raman spectroscopy method to probe one-particle excitations, Fermi surfaces, and quasiparticles in strongly interacting ultracold fermionic gases, with simulated results demonstrating its effectiveness.

Contribution

The paper presents a novel Raman spectroscopy technique capable of directly measuring Green's functions and quasiparticle properties in ultracold fermionic systems.

Findings

Spectra are experimentally accessible and clearly show quasiparticle features.

Simulated images validate the method for Fermi liquids and exotic states like d-wave pseudo-gaps.

Signatures of complex many-body phenomena are identifiable with the proposed technique.

Abstract

We propose a Raman spectroscopy technique which is able to probe the one-particle Green's function, the Fermi surface, and the quasiparticles of a gas of strongly interacting ultracold atoms. We give quantitative examples of experimentally accessible spectra. The efficiency of the method is validated by means of simulated images for the case of a usual Fermi liquid as well as for more exotic states: specific signatures of e.g. a d-wave pseudo-gap are clearly visible.