English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We study the elastic scattering time $\tau_\mathrm{s}$ of ultracold atomspropagating in optical disordered potentials in the strong scattering regime,going beyond the recent work of J. Richard \emph{et al.} \textit{Phys. Rev.Lett.} \textbf{122} 100403 (2019). There, we identified the crossover betweenthe weak and the strong scattering regimes by comparing direct measurements andnumerical simulations to the first order Born approximation. Here we focusspecifically on the strong scattering regime, where the first order Bornapproximation is not valid anymore and the scattering time is stronglyinfluenced by the nature of the disorder. To interpret our observations, weconnect the scattering time $\tau_\mathrm{s}$ to the profiles of the spectralfunctions that we estimate using higher order Born perturbation theory orself-consistent Born approximation. The comparison reveals that self-consistentmethods are well suited to describe $\tau_\mathrm{s}$ for Gaussian-distributeddisorder, but fails for laser speckle disorder. For the latter, we show thatthe peculiar profiles of the spectral functions, as measured independently inV. Volchkov \emph{et al.} \textit{Phys. Rev. Lett.} \textbf{120}, 060404(2018), must be taken into account. Altogether our study characterizes thevalidity range of usual theoretical methods to predict the elastic scatteringtime of matter waves, which is essential for future close comparison betweentheory and experiments, for instance regarding the ongoing studies on Andersonlocalization.

Ultracold Atoms in Disordered Potentials: Elastic Scattering Time in the Strong Scattering Regime