Ultracold atoms in disordered potentials: elastic scattering time in the strong scattering regime
Open Access
- 20 September 2019
- journal article
- research article
- Published by IOP Publishing in New Journal of Physics
- Vol. 21 (10), 105002
- https://doi.org/10.1088/1367-2630/ab466f
Abstract
We study the elastic scattering time τS of ultracold atoms propagating in optical disordered potentials in the strong scattering regime, going beyond the recent work of J. Richard et al., Phys. Rev. Lett. 122 100403 (2019). There, we identified the crossover between the weak and the strong scattering regimes by comparing direct measurements and numerical simulations to the first order Born approximation. Here we focus specifically on the strong scattering regime, where first order Born approximation is not valid anymore and the scattering time is strongly influenced by the nature of the disorder. To interpret our observations, we connect the scattering time τS to the profiles of the spectral functions that we estimate using higher order Born perturbation theory or self-consistent Born approximation. The comparison reveals that self-consistent methods are well suited to describe τS for Gaussian-distributed disorder, but fails for laser speckle disorder. For the latter, we show that the peculiar profiles of the spectral functions, as measured independently in V. Volchkov et al., Phys. Rev. Lett. 120, 060404 (2018), must be taken into account. Altogether our study characterizes the validity range of usual theoretical methods to predict the elastic scattering time of matter waves, which is essential for future close comparison between theory and experiments, for instance regarding the ongoing studies on Anderson localizationKeywords
Funding Information
- H2020 Marie Skłodowska-Curie Actions (655933)
- H2020 European Research Council (641122)
- DIM Sirteq
- Association Nationale de la Recherche et de la Technologie
- Institut Universitaire de France
- Simons Foundation (563916)
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