Work

Out-of-equilibrium dynamical properties of Bose-Einstein condensates in a ramped up weak disorder

Year: 2026

Type: article

Abstract: We theoretically study how the superfluid and condensate deformation of a weakly interacting ultracold Bose gas evolve during the ramp-up of an external weak disorder potential. Both resulting deformations turn out to consist of two distinct contributions, namely a reversible equilibrium one, already predicted by Huang and Meng in 1992, and a nonequilibrium dynamical one, whose magnitude depends on the details of the ramping protocol. For the specific case of the exponential ramp-up protocol, we are able to derive analytical time-dependent expressions for the above quantities. After a sufficiently long time, a steady state emerges that is generically out of equilibrium. We take the first step in investigating its properties by studying its relaxation dynamics. In addition, we analyze the two-time correlation function and elucidate its relation to the equilibrium and the dynamical part of the condensate deformation.

Source: SciPost Physics

DOI: 10.21468/scipostphys.20.1.010

Authors: Rodrigo P. A. Lima, Milan Radonjić, Axel Pelster

Institutions: University of Castilla-La Mancha, Universidade Federal de Alagoas, Universität Hamburg, Institute of Physics Belgrade, Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau

Language: English

Topic: Cold Atom Physics and Bose-Einstein Condensates

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond