Quench dynamics of an ultracold two-dimensional Bose gas

Anno: 2019

Autori: Comaron P., Larcher F., Dalfovo F., Proukakis N. P.

Affiliazione autori: Newcastle Univ, Joint Quantum Ctr Durham Newcastle, Sch Math Stat & Phys, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England; Univ Trento, INO CNR BEC Ctr, Via Sommar 14, I-38123 Trento, Italy; Univ Trento, Dipartimento Fis, Via Sommar 14, I-38123 Trento, Italy

Abstract: We study the dynamics of a two-dimensional Bose gas after an instantaneous quench of an initially ultracold thermal atomic gas across the Berezinskii-Kosterlitz-Thouless phase transition, confirming via stochastic simulations that the system undergoes phase-ordering kinetics and fulfills the dynamical scaling hypothesis at late-time dynamics. Specifically, we find in that regime the vortex number decaying in time as < N-v > proportional to t(-1), consistent with a dynamical critical exponent z approximate to 2 for both temperature and interaction quenches. Focusing on finite-size boxlike geometries, we demonstrate that such an observation is within current experimental reach.

Giornale/Rivista: PHYSICAL REVIEW A

Volume: 100 (3)      Da Pagina: 033618-1  A: 033618-10

Maggiori informazioni: We would like to thank C. Barenghi, T. Billam, T. Bland, J. Dalibard, J. Schmitt, Z. Hadzibabic, and A. Groszek for fruitful discussions. We acknowledge financial support from the Quantera ERA-NET cofund project NAQUAS through the Consiglio Nazionale delle Ricerche (F.D. and F.L.) and the Engineering and Physical Science Research Council, Grant No. EP/R043434/1 (P.C. and N.P.P.). We acknowledge the Engineering and Physical Science Research Council, Grant No. EP/L504828/1, for DTA support. This work is also supported by Provincia Autonoma di Trento.
DOI: 10.1103/PhysRevA.100.033618

Citazioni: 15
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-06-23
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