Observation of vortex-antivortex pairing in decaying 2D turbulence of a superfluid gas

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 invisc...

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Autores principales:	Sang Won Seo, Bumsuk Ko, Joon Hyun Kim, Y. Shin
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/491064c931db4dd8b8c90254b8aa4e35
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spelling	oai:doaj.org-article:491064c931db4dd8b8c90254b8aa4e352021-12-02T16:07:02ZObservation of vortex-antivortex pairing in decaying 2D turbulence of a superfluid gas10.1038/s41598-017-04122-92045-2322https://doaj.org/article/491064c931db4dd8b8c90254b8aa4e352017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04122-9https://doaj.org/toc/2045-2322Abstract 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.Sang Won SeoBumsuk KoJoon Hyun KimY. ShinNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Sang Won Seo Bumsuk Ko Joon Hyun Kim Y. Shin Observation of vortex-antivortex pairing in decaying 2D turbulence of a superfluid gas
description	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.
format	article
author	Sang Won Seo Bumsuk Ko Joon Hyun Kim Y. Shin
author_facet	Sang Won Seo Bumsuk Ko Joon Hyun Kim Y. Shin
author_sort	Sang Won Seo
title	Observation of vortex-antivortex pairing in decaying 2D turbulence of a superfluid gas
title_short	Observation of vortex-antivortex pairing in decaying 2D turbulence of a superfluid gas
title_full	Observation of vortex-antivortex pairing in decaying 2D turbulence of a superfluid gas
title_fullStr	Observation of vortex-antivortex pairing in decaying 2D turbulence of a superfluid gas
title_full_unstemmed	Observation of vortex-antivortex pairing in decaying 2D turbulence of a superfluid gas
title_sort	observation of vortex-antivortex pairing in decaying 2d turbulence of a superfluid gas
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/491064c931db4dd8b8c90254b8aa4e35
work_keys_str_mv	AT sangwonseo observationofvortexantivortexpairingindecaying2dturbulenceofasuperfluidgas AT bumsukko observationofvortexantivortexpairingindecaying2dturbulenceofasuperfluidgas AT joonhyunkim observationofvortexantivortexpairingindecaying2dturbulenceofasuperfluidgas AT yshin observationofvortexantivortexpairingindecaying2dturbulenceofasuperfluidgas
_version_	1718384773267718144

Observation of vortex-antivortex pairing in decaying 2D turbulence of a superfluid gas

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