Weakly interacting disordered Bose gases out of equilibrium: from multiple scattering to superfluidity

Autor:	Scoquart, Thibault, Larré, Pierre-Élie, Delande, Dominique, Cherroret, Nicolas
Rok vydání:	2020
Předmět:	Condensed Matter - Quantum Gases Condensed Matter - Disordered Systems and Neural Networks
Zdroj:	EPL 132, 66001 (2020)
Druh dokumentu:	Working Paper
DOI:	10.1209/0295-5075/132/66001
Popis:	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. Comment: 6 pages, 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2012.05526 Zobrazit plný text záznamu View this record from Arxiv