Probing spatial spin correlations of ultracold gases by quantum noise spectroscopy

TL;DR

This paper demonstrates theoretically that spin noise spectroscopy using a single laser beam can directly probe the spatial spin correlations in ultracold fermionic gases, revealing various many-body phenomena.

Contribution

It introduces a method to measure spatial spin correlations in cold gases via spin noise spectroscopy, highlighting its ability to detect complex many-body states.

Findings

Spin noise varies with laser width, temperature, and frequency.

Anti-bunching, pairing, and magnetic correlations can be identified.

Method provides a non-invasive probe of quantum many-body phenomena.

Abstract

Spin noise spectroscopy with a single laser beam is demonstrated theoretically to provide a direct probe of the spatial correlations of cold fermionic gases. We show how the generic many-body phenomena of anti-bunching, pairing, antiferromagnetic, and algebraic spin liquid correlations can be revealed by measuring the spin noise as a function of laser width, temperature, and frequency.