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강상관계 물질 연구단
강상관계 물질 연구단
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Observation of vortex-Antivortex pairing in decaying 2D turbulence of a superfluid gas

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Title
Observation of vortex-Antivortex pairing in decaying 2D turbulence of a superfluid gas
Author(s)
Sang Won Seo; Bumsuk Ko; Joon Hyun Kim; Yong il Shin
Publication Date
2017-07
Journal
Scientific Reports, v.7, no.1, pp.1 - 8
Publisher
NATURE PUBLISHING GROUP
Abstract
In a two-dimensional (2D) classical fluid, a large-scale flow structure emerges out of turbulence, which is known as the inverse energy cascade where energy flows from small to large length scales. An interesting question is whether this phenomenon can occur in a superfluid, which is inviscid and irrotational by nature. Atomic Bose-Einstein condensates (BECs) of highly oblate geometry provide an experimental venue for studying 2D superfluid turbulence, but their full investigation has been hindered due to a lack of the circulation sign information of individual quantum vortices in a turbulent sample. Here, we demonstrate a vortex sign detection method by using Bragg scattering, and we investigate decaying turbulence in a highly oblate BEC at low temperatures, with our lowest being ~0.5T c, where T c is the superfluid critical temperature. We observe that weak spatial pairing between vortices and antivortices develops in the turbulent BEC, which corresponds to the vortex-dipole gas regime predicted for high dissipation. Our results provide a direct quantitative marker for the survey of various 2D turbulence regimes in the BEC system. © 2017 The Author(s)
URI
http://pr.ibs.re.kr/handle/8788114/4796
ISSN
2045-2322
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
Files in This Item:
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