2017/03/21 by Aisling Johnson, A. Johnson, Stuart S. Szigeti +4 · 2 citations
Mathematics · Physics and Astronomy · #Atom (system on chip) #Bose gas #Bose–Einstein condensate #Cold Atom Physics and Bose-Einstein Condensates #Field (mathematics) #Harmonic potential #Homogeneous #Integrable system #Mathematical physics #Mathematics #Nonlinear system #Physics #Quantum #Quantum many-body systems #Quantum mechanics #State (computer science) #Stationary state #Statistical physics #Strong Light-Matter Interactions #Thermal #Thermodynamics #cond-mat.quant-gas
paper · pdf · doi:10.1103/physreva.96.013623
published as Phys. Rev. A 96, 013623 (2017)
arxiv created 2017/03/21 · openalex publication_date 2017/07/24 · arxiv updated 2017/08/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate the cooling produced by a loss process nonselective in energy on a one-dimensional (1D) Bose gas with repulsive contact interactions in the quasicondensate regime. By performing nonlinear classical-field calculations for a homogeneous system, we show that the gas reaches a nonthermal state where different modes have acquired different temperatures. After losses have been turned off, this state is robust with respect to the nonlinear dynamics, described by the Gross-Pitaevskii equation. We argue that the integrability of the Gross-Pitaevskii equation is linked to the existence of such long-lived nonthermal states and illustrate this by showing that such states are not supported within a nonintegrable model of two coupled 1D gases of different masses. We go beyond a classical-field analysis, taking into account the quantum noise introduced by the discreteness of losses, and show that the nonthermal state is still produced and its nonthermal character is even enhanced. Finally, we extend the discussion to gases trapped in a harmonic potential and present experimental observations of a long-lived nonthermal state within a trapped 1D quasicondensate following an atom-loss process.