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Defect Saturation in a Rapidly Quenched Bose Gas

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Title
Defect Saturation in a Rapidly Quenched Bose Gas
Author(s)
Goo, Junhong; Younghoon Lim; Yong-il Shin
Publication Date
2021-09-10
Journal
Physical Review Letters, v.127, no.11
Publisher
American Physical Society
Abstract
© 2021 American Physical Society.We investigate the saturation of defect density in an atomic Bose gas rapidly cooled into a superfluid phase. The number of quantum vortices, which are spontaneously created in the quenched gas, exhibits a Poissonian distribution not only for a slow quench in the Kibble-Zurek (KZ) scaling regime but also for a fast quench, in which case the mean vortex number is saturated. This shows that the saturation is not caused by destructive vortex collisions, but by the early-time coarsening in an emerging condensate, which is further supported by the observation that the condensate growth lags the quenching in the saturation regime. Our results demonstrate that the defect saturation is an effect beyond the KZ mechanism, opening a path for studying critical phase transition dynamics using the defect number distribution.
URI
https://pr.ibs.re.kr/handle/8788114/10361
DOI
10.1103/PhysRevLett.127.115701
ISSN
0031-9007
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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