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Elastic Scattering Time of Matter-Waves in Disordered Potentials

2018

Article

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We report on the direct measurement of the elastic scattering time $τ_\mathrm{s}$ of ultracold atoms propagating in optical disordered potentials. By exploring this fundamental quantity over a large range of experimental parameters, we observe variations of $τ_\mathrm{s}$ over more than three orders of magnitude, in excellent agreement with numerical calculations. It allows us to study the crossover from the weak to the strong scattering regimes, which are explicitly identified by a comparison to the first order Born approximation. We especially discuss the relevance of the widely used criterion $k l_\mathrm{s}\sim 1$ to locate this crossover. While it is validated for a Gaussian disorder, it breaks down for the laser speckle disorders used in the experiments, where large deviations to Born predictions are observed. This result highlights the strong influence of the disorder statistics on the crossover and, more generally, on the behavior of the time $τ_\mathrm{s}$ in the strong scattering regime.

Author(s): Jérémie Richard and Lih-King Lim and Vincent Denechaud and Valentin Volchkov and Baptiste Lecoutre and Musawwadah Mukhtar and Fred Jendrzejewski and Alain Aspect and Adrien Signoles and Laurent Sanchez-Palencia and Vincent Josse
Journal: arXiv preprint
Volume: arXiv:1810.07574v2
Year: 2018
Month: October

Department(s): Optics & Sensing Laboratory
Bibtex Type: Article (article)
Paper Type: Journal

Digital: True
State: Submitted

BibTex

@article{tauS18,
  title = {Elastic Scattering Time of Matter-Waves in Disordered Potentials},
  author = {Richard, Jérémie and Lim, Lih-King and Denechaud, Vincent and Volchkov, Valentin and Lecoutre, Baptiste and Mukhtar, Musawwadah and Jendrzejewski, Fred and Aspect, Alain and Signoles, Adrien and Sanchez-Palencia, Laurent and Josse, Vincent},
  journal = {arXiv preprint},
  volume = {arXiv:1810.07574v2 },
  month = oct,
  year = {2018},
  month_numeric = {10}
}