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Variations of the Kibble-Zurek scaling exponents of trapped Bose gases

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Title
Variations of the Kibble-Zurek scaling exponents of trapped Bose gases
Author(s)
Tenzin Rabga; Yangheon Lee; Dalmin Bae; Myeonghyeon Kim; Y. Shin
Publication Date
2023-08
Journal
Physical Review A, v.108, no.2
Publisher
American Physical Society
Abstract
We study the vortex nucleation dynamics in inhomogeneous atomic Bose gases quenched into a superfluid phase and investigate the dependence of the Kibble-Zurek (KZ) scaling exponent on the underlying trap configuration. For samples in a number of different inhomogeneous traps, we observe the characteristic power-law scaling of the vortex number with the thermal quench rate, as well as an enhanced vortex suppression in the outer regions with lower particle density, in agreement with the causality effect as encapsulated in the inhomogeneous Kibble-Zurek mechanism (IKZM). However, the measured KZ scaling exponents show significant differences from the theoretical estimates, and furthermore their trends as a function of the underlying trap configuration deviate from the IKZM prediction. We also investigate the early-time coarsening effect using a two-step quench protocol as proposed in a recent study and show that the interpretation of the measurement results without including the causality effect might be misleading. This paper provides a comprehensive study of vortex formation dynamics in quenched Bose gases confined in inhomogeneous trapping potentials and calls for a refined theoretical framework for quantitative understanding of the phase transition and defect formation processes in such inhomogeneous systems. © 2023 American Physical Society.
URI
https://pr.ibs.re.kr/handle/8788114/14031
DOI
10.1103/PhysRevA.108.023315
ISSN
2469-9926
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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