Ultracold atoms in disordered potentials: elastic scattering time in the strong scattering regime - Institut d'Optique Graduate School Access content directly
Journal Articles New Journal of Physics Year : 2019

Ultracold atoms in disordered potentials: elastic scattering time in the strong scattering regime

Abstract

We study the elastic scattering time τ s 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 the 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 τ s 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 τ s 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 localization.
Fichier principal
Vignette du fichier
TauS_NJP_arXiv_online.pdf (3.82 Mo) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-02356093 , version 1 (08-11-2019)

Identifiers

Cite

Adrien Signoles, Baptiste Lecoutre, Jérémie Richard, Lih-King Lim, Vincent Denechaud, et al.. Ultracold atoms in disordered potentials: elastic scattering time in the strong scattering regime. New Journal of Physics, 2019, 21 (10), pp.105002. ⟨10.1088/1367-2630/ab466f⟩. ⟨hal-02356093⟩
78 View
73 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More