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

Anno: 2018

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

Affiliazione autori: Univ Antwerp, TQC, Univ Splein 1, B-2610 Antwerp, Belgium; Univ Trento, 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.

Giornale/Rivista: PHYSICAL REVIEW A

Volume: 98 (5)      Da Pagina: 53612-1  A: 53612-7

Maggiori informazioni: M.V.R. gratefully acknowledges support in the form of a Ph.D. fellowship from the Research Foundation-Flanders (FWO) and hospitality at the BEC Center in Trento. H.K. was supported by the FWO and the European Union H2020 program under MSC Grant Agreement No. 665501. M.W. acknowledges financial support from the FWO-Odysseus program. I.C. was funded by the EU-FET proactive grant AQuS, Project No. 640800 and by Provincia Autonoma di Trento.
Parole chiavi: Quantum; System
DOI: 10.1103/PhysRevA.98.053612

Citazioni: 20
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-10-13
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