Volume 132, Number 6, December 2020
|Number of page(s)||7|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||04 March 2021|
Weakly interacting disordered Bose gases out of equilibrium: From multiple scattering to superfluidity(a)
1 Laboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS- Université PSL, Collège de France 4 Place Jussieu, 75005 Paris, France
2 CY Cergy Paris Université, CNRS, LPTM - F-95000 Cergy, France
Received: 10 December 2020
Accepted: 4 February 2021
We explore the quench dynamics of a two-dimensional, weakly interacting disordered Bose gas for various relative strengths of interactions and disorder. This allows us to identify two well distinct out-of-equilibrium regimes. When interactions are smaller than the disorder, the gas experiences multiple scattering and exhibits a short-range spatial coherence. At short time this coherence is only smoothly affected by interactions, via a diffusion process of the particles' energies. When interactions are larger than the disorder, scattering ceases and the gas behaves more and more like a fluid, ultimately like a superfluid at low energy. In the superfluid regime, the gas exhibits a long-range algebraic coherence, characteristic of a pre-thermal regime in disorder.
PACS: 67.85.De – Dynamic properties of condensates; excitations, and superfluid flow / 03.75.-b – Matter waves / 42.25.Dd – Wave propagation in random media
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