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강상관계 물질 연구단
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Observation of von Kármán Vortex Street in an Atomic Superfluid Gas

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Title
Observation of von Kármán Vortex Street in an Atomic Superfluid Gas
Author(s)
Woo Jin Kwon; Joon Hyun Kim; Sang Won Seo; Yong il Shin
Publication Date
2016-12
Journal
PHYSICAL REVIEW LETTERS, v.117, no.24, pp.245301 -
Publisher
AMER PHYSICAL SOC
Abstract
We report on the experimental observation of vortex cluster shedding from a moving obstacle in an oblate atomic Bose-Einstein condensate. At low obstacle velocities v above a critical value, vortex clusters consisting of two like-sign vortices are generated to form a regular configuration like a von Kármán street, and as v is increased, the shedding pattern becomes irregular with many different kinds of vortex clusters. In particular, we observe that the Stouhal number associated with the shedding frequency exhibits saturation behavior with increasing v. The regular-to-turbulent transition of the vortex cluster shedding reveals remarkable similarities between a superfluid and a classical viscous fluid. Our work opens a new direction for experimental investigations of the superfluid Reynolds number characterizing universal superfluid hydrodynamics. © 2016 American Physical Society
URI
http://pr.ibs.re.kr/handle/8788114/3214
ISSN
0031-9007
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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