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Vortex shedding frequency of a moving obstacle in a Bose-Einstein condensate

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Title
Vortex shedding frequency of a moving obstacle in a Bose-Einstein condensate
Author(s)
Younghoon Lim; Yangheon Lee; Goo, Junhong; Dalmin Bae; Y Shin
Publication Date
2022-08
Journal
NEW JOURNAL OF PHYSICS, v.24, no.8
Publisher
IOP Publishing Ltd
Abstract
We experimentally investigate the periodic vortex shedding dynamics in a highly oblate Bose-Einstein condensate using a moving penetrable Gaussian obstacle. The shedding frequency f (v) is measured as a function of the obstacle velocity v and characterized by a linear relationship of f (v) = a(v - v (c)) with v (c) being the critical velocity. The proportionality constant a is linearly decreased with a decrease in the obstacle strength, whereas v (c) approaches the speed of sound. When the obstacle size increases, both a and v (c) are decreased. We discuss a possible association of a with the Strouhal number in the context of universal shedding dynamics of a superfluid. The critical vortex shedding is further investigated for an oscillating obstacle and found to be consistent with the measured f (v). When the obstacle's maximum velocity exceeds v (c) but its oscillation amplitude is not large enough to create a vortex dipole, we observe that vortices are generated in the low-density boundary region of the trapped condensate, which is attributed to the phonon emission from the oscillating obstacle.
URI
https://pr.ibs.re.kr/handle/8788114/12341
DOI
10.1088/1367-2630/ac8656
ISSN
1367-2630
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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