Scientific Results

Prethermalization to thermalization crossover in a dilute Bose gas following an interaction ramp

Year: 2018

Authors: Van Regemortel M., Kurkjian H., Wouters M. I., Carusotto I.

Autors Affiliation: Univ Antwerp, TQC, Univ Splein 1, B-2610 Antwerp, Belgium; CNR, BEC Ctr, INO, Via Sommar 14, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, Via Sommar 14, I-38123 Povo, Italy.

Abstract: The dynamics of a weakly interacting Bose gas at low temperatures is close to integrable due to the approximate quadratic nature of the many-body Hamiltonian. While the short-time physics after an abrupt ramp of the interaction constant is dominated by integrable dynamics, integrability is broken at longer times by higher-order interaction terms in the Bogoliubov Hamiltonian, in particular, by Beliaev-Landau scatterings involving three quasiparticles. The two-stage relaxation process is highlighted in the evolution of local observables such as the density-density correlation function: an integrable dephasing mechanism leads the system to a prethermal stage, followed by true thermalization conveyed by quasiparticle collisions. Our results bring the crossover from prethermalization to thermalization within reach of current experiments with ultracold atomic gases.

Journal/Review: PHYSICAL REVIEW A

Volume: 98 (5)      Pages from: 053612-1  to: 053612-7

KeyWords: quantum; system;
DOI: 10.1103/PhysRevA.98.053612

Citations: 4
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English