Diffusive density profiles in a cold-atom expansion experiment
Quantum Gases
2014-09-17 v2
Abstract
In a recent experiment [McGehee et al., Phys. Rev. Lett. 111, 145303 (2013)], the expansion of non-interacting ultracold fermions was studied in a random speckle potential, and the observed density profiles were interpreted based on 3D Anderson localization. The purpose of this note is to demonstrate that slow diffusion of particles with a broad energy distribution and an energy-dependent diffusion coefficient leads to density profiles that agree with the measured data, but not with the behavior expected for 3D Anderson localization.
Cite
@article{arxiv.1406.5107,
title = {Diffusive density profiles in a cold-atom expansion experiment},
author = {Cord A. Müller and Boris Shapiro},
journal= {arXiv preprint arXiv:1406.5107},
year = {2014}
}
Comments
1 page. Comment on arXiv:1307.7175; v2: minor changes to final, published version