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Evolution of the dynamics of neutral superconductors between BCS and BEC regimes: the variational approach

Evolution of the dynamics of neutral superconductors between BCS and BEC regimes: the variational approach

We use variational approach to analyze the evolution of the dynamics of a neutral s-wave superconductor between BCS and BEC regimes. We consider 2D case, when BCS–BEC crossover occurs already at weak coupling and is governed by the ratio of the two scales — the Fermi energy EF and the bound state en...

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Main Authors: Chubukov, A.V., Mozyrsky, D.
Format: Article
Language:English
Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2018
Series:Физика низких температур
Subjects:
Специальный выпуск К 90-летию со дня рождения A.A. Абрикосова
Online Access:http://dspace.nbuv.gov.ua/handle/123456789/176148
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spelling irk-123456789-1761482021-02-04T01:30:18Z Evolution of the dynamics of neutral superconductors between BCS and BEC regimes: the variational approach Chubukov, A.V. Mozyrsky, D. Специальный выпуск К 90-летию со дня рождения A.A. Абрикосова We use variational approach to analyze the evolution of the dynamics of a neutral s-wave superconductor between BCS and BEC regimes. We consider 2D case, when BCS–BEC crossover occurs already at weak coupling and is governed by the ratio of the two scales — the Fermi energy EF and the bound state energy for two fermions in a vacuum, E₀. BCS and BEC regimes correspond to EF >> E₀ and EF << E₀, respectively. We compute the spectrum of low-energy bosonic excitations and show that the velocity of phase fluctuations remains υF / √2 through BCS–BEC crossover. We also discuss the topological Aφ ̇ term in the effective action. 2018 Article Evolution of the dynamics of neutral superconductors between BCS and BEC regimes: the variational approach / A.V. Chubukov, D. Mozyrsky // Физика низких температур. — 2018. — Т. 44, № 6. — С. 684-690. — Бібліогр.: 42 назв. — англ. 0132-6414 PACS: 74.20.Fg, 74.25.Вt, 74.78.–w http://dspace.nbuv.gov.ua/handle/123456789/176148 en Физика низких температур Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
institution Digital Library of Periodicals of National Academy of Sciences of Ukraine
collection DSpace DC
language English
topic Специальный выпуск К 90-летию со дня рождения A.A. Абрикосова
Специальный выпуск К 90-летию со дня рождения A.A. Абрикосова
spellingShingle Специальный выпуск К 90-летию со дня рождения A.A. Абрикосова
Специальный выпуск К 90-летию со дня рождения A.A. Абрикосова
Chubukov, A.V.
Mozyrsky, D.
Evolution of the dynamics of neutral superconductors between BCS and BEC regimes: the variational approach
Физика низких температур
description We use variational approach to analyze the evolution of the dynamics of a neutral s-wave superconductor between BCS and BEC regimes. We consider 2D case, when BCS–BEC crossover occurs already at weak coupling and is governed by the ratio of the two scales — the Fermi energy EF and the bound state energy for two fermions in a vacuum, E₀. BCS and BEC regimes correspond to EF >> E₀ and EF << E₀, respectively. We compute the spectrum of low-energy bosonic excitations and show that the velocity of phase fluctuations remains υF / √2 through BCS–BEC crossover. We also discuss the topological Aφ ̇ term in the effective action.
format Article
author Chubukov, A.V.
Mozyrsky, D.
author_facet Chubukov, A.V.
Mozyrsky, D.
author_sort Chubukov, A.V.
title Evolution of the dynamics of neutral superconductors between BCS and BEC regimes: the variational approach
title_short Evolution of the dynamics of neutral superconductors between BCS and BEC regimes: the variational approach
title_full Evolution of the dynamics of neutral superconductors between BCS and BEC regimes: the variational approach
title_fullStr Evolution of the dynamics of neutral superconductors between BCS and BEC regimes: the variational approach
title_full_unstemmed Evolution of the dynamics of neutral superconductors between BCS and BEC regimes: the variational approach
title_sort evolution of the dynamics of neutral superconductors between bcs and bec regimes: the variational approach
publisher Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
publishDate 2018
topic_facet Специальный выпуск К 90-летию со дня рождения A.A. Абрикосова
url http://dspace.nbuv.gov.ua/handle/123456789/176148
citation_txt Evolution of the dynamics of neutral superconductors between BCS and BEC regimes: the variational approach / A.V. Chubukov, D. Mozyrsky // Физика низких температур. — 2018. — Т. 44, № 6. — С. 684-690. — Бібліогр.: 42 назв. — англ.
series Физика низких температур
work_keys_str_mv AT chubukovav evolutionofthedynamicsofneutralsuperconductorsbetweenbcsandbecregimesthevariationalapproach
AT mozyrskyd evolutionofthedynamicsofneutralsuperconductorsbetweenbcsandbecregimesthevariationalapproach
first_indexed 2023-10-18T22:40:36Z
last_indexed 2023-10-18T22:40:36Z
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