Momentum-resolved study of an array of 1D strongly phase-fluctuating Bose gases

TL;DR

This paper studies the coherence properties of 1D Bose gases with phase fluctuations, using Bragg spectroscopy and a novel imaging method to measure coherence length, with implications for disorder effects.

Contribution

It introduces a simple imaging technique to directly measure coherence length in strongly fluctuating 1D Bose gases, advancing experimental capabilities.

Findings

Effective coherence length measurement via Bragg spectroscopy.

Demonstration of time-of-flight imaging as a probe for coherence.

Potential application to disorder effects on phase coherence.

Abstract

We investigate the coherence properties of an array of one-dimensional Bose gases with short-scale phase fluctuations. The momentum distribution is measured using Bragg spectroscopy and an effective coherence length of the whole ensemble is defined. In addition, we propose and demonstrate that time-of-flight absorption imaging can be used as a simple probe to directly measure the coherence-length of 1D gases in the regime where phase-fluctuations are strong. This method is suitable for future studies such as investigating the effect of disorder on the phase coherence.