Berezinskii–Kosterlitz–Thouless phase induced by dissipating quasisolitons

Abstract We theoretically study the sound propagation in a two-dimensional weakly interacting uniform Bose gas. Using the classical fields approximation we analyze in detail the properties of density waves generated both in a weak and strong perturbation regimes. While in the former case density exc...

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Autores principales:	Krzysztof Gawryluk, Mirosław Brewczyk
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/dba36e0723c944f7b5ae293f863a747e
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spelling	oai:doaj.org-article:dba36e0723c944f7b5ae293f863a747e2021-12-02T15:00:19ZBerezinskii–Kosterlitz–Thouless phase induced by dissipating quasisolitons10.1038/s41598-021-90169-82045-2322https://doaj.org/article/dba36e0723c944f7b5ae293f863a747e2021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-90169-8https://doaj.org/toc/2045-2322Abstract We theoretically study the sound propagation in a two-dimensional weakly interacting uniform Bose gas. Using the classical fields approximation we analyze in detail the properties of density waves generated both in a weak and strong perturbation regimes. While in the former case density excitations can be described in terms of hydrodynamic or collisionless sound, the strong disturbance of the system results in a qualitatively different response. We identify observed structures as quasisolitons and uncover their internal complexity for strong perturbation case. For this regime quasisolitons break into vortex pairs as time progresses, eventually reaching an equilibrium state. We find this state, characterized by only fluctuating in time averaged number of pairs of opposite charge vortices and by appearance of a quasi-long-range order, as the Berezinskii–Kosterlitz–Thouless (BKT) phase.Krzysztof GawrylukMirosław BrewczykNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Krzysztof Gawryluk Mirosław Brewczyk Berezinskii–Kosterlitz–Thouless phase induced by dissipating quasisolitons
description	Abstract We theoretically study the sound propagation in a two-dimensional weakly interacting uniform Bose gas. Using the classical fields approximation we analyze in detail the properties of density waves generated both in a weak and strong perturbation regimes. While in the former case density excitations can be described in terms of hydrodynamic or collisionless sound, the strong disturbance of the system results in a qualitatively different response. We identify observed structures as quasisolitons and uncover their internal complexity for strong perturbation case. For this regime quasisolitons break into vortex pairs as time progresses, eventually reaching an equilibrium state. We find this state, characterized by only fluctuating in time averaged number of pairs of opposite charge vortices and by appearance of a quasi-long-range order, as the Berezinskii–Kosterlitz–Thouless (BKT) phase.
format	article
author	Krzysztof Gawryluk Mirosław Brewczyk
author_facet	Krzysztof Gawryluk Mirosław Brewczyk
author_sort	Krzysztof Gawryluk
title	Berezinskii–Kosterlitz–Thouless phase induced by dissipating quasisolitons
title_short	Berezinskii–Kosterlitz–Thouless phase induced by dissipating quasisolitons
title_full	Berezinskii–Kosterlitz–Thouless phase induced by dissipating quasisolitons
title_fullStr	Berezinskii–Kosterlitz–Thouless phase induced by dissipating quasisolitons
title_full_unstemmed	Berezinskii–Kosterlitz–Thouless phase induced by dissipating quasisolitons
title_sort	berezinskii–kosterlitz–thouless phase induced by dissipating quasisolitons
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/dba36e0723c944f7b5ae293f863a747e
work_keys_str_mv	AT krzysztofgawryluk berezinskiikosterlitzthoulessphaseinducedbydissipatingquasisolitons AT mirosławbrewczyk berezinskiikosterlitzthoulessphaseinducedbydissipatingquasisolitons
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Berezinskii–Kosterlitz–Thouless phase induced by dissipating quasisolitons

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