1D Bose Gases in an Optical Lattice

TL;DR

This paper investigates the momentum distribution and coherence properties of a one-dimensional Bose gas in an optical lattice, providing experimental measurements that compare with theoretical predictions.

Contribution

It presents new experimental data on the condensate depletion and coherence length in 1D Bose gases with varying site occupation, enhancing understanding of quantum many-body effects.

Findings

Measured condensate depletion and compared with theory

Determined coherence length for different site occupations

Provided experimental validation of theoretical models

Abstract

We report on the study of the momentum distribution of a one-dimensional Bose gas in an optical lattice. From the momentum distribution we extract the condensed fraction of the gas and thereby measure the depletion of the condensate and compare it with a theorical estimate. We have measured the coherence length of the gas for systems with average occupation $\bar{n}>1$ and $\bar{n}<1$ per lattice site.