2020/12/01 by Thibault Scoquart, T. Scoquart, P.-É. Larré +5 · 1 citation
Physics and Astronomy · #Bose gas #Coherence (philosophical gambling strategy) #Coherence length #Cold Atom Physics and Bose-Einstein Condensates #Diffusion #Quantum many-body systems #Quantum, superfluid, helium dynamics #Scattering #Scattering length #Superfluidity #cond-mat.dis-nn #cond-mat.quant-gas
paper · pdf · doi:10.1209/0295-5075/132/66001
published as EPL 132, 66001 (2020) · 6 pages, 4 figures
openalex publication_date 2020/12/01 · arxiv created 2020/12/10 · openalex created_date 2020/12/21 · arxiv updated 2021/06/22 · openalex updated_date 2026/08/06
Abstract 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.