SciPost Phys. 20, 010 (2026) ·
published 16 January 2026
|
· pdf
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.
Prof. Lima: "**Reply to the report of Refer..."
in Submissions | submission on Out-of-equilibrium dynamical properties of Bose-Einstein condensates in a ramped up weak disorder by Rodrigo P. A. Lima, Milan Radonjić, Axel Pelster