Superfluid density, Josephson relation and pairing fluctuations in a multi-component fermion superfluid

Abstract In this work, a Josephson relation is generalized to a multi-component fermion superfluid. Superfluid density is expressed through a two-particle Green function for pairing states. When the system has only one gapless collective excitation mode, the Josephson relation is simplified, which i...

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Autor principal:	Yi-Cai Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/be6630bdfdf146c882bd312568288817
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spelling	oai:doaj.org-article:be6630bdfdf146c882bd3125682888172021-11-14T12:17:43ZSuperfluid density, Josephson relation and pairing fluctuations in a multi-component fermion superfluid10.1038/s41598-021-01261-y2045-2322https://doaj.org/article/be6630bdfdf146c882bd3125682888172021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-01261-yhttps://doaj.org/toc/2045-2322Abstract In this work, a Josephson relation is generalized to a multi-component fermion superfluid. Superfluid density is expressed through a two-particle Green function for pairing states. When the system has only one gapless collective excitation mode, the Josephson relation is simplified, which is given in terms of the superfluid order parameters and the trace of two-particle normal Green function. In addition, it is found that the matrix elements of two-particle Green function is directly related to the matrix elements of the pairing fluctuations of superfluid order parameters. Furthermore, in the presence of inversion symmetry, the superfluid density is given in terms of the pairing fluctuation matrix. The results of the superfluid density in Haldane model show that the generalized Josephson relation can be also applied to a multi-band fermion superfluid in lattice.Yi-Cai ZhangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yi-Cai Zhang Superfluid density, Josephson relation and pairing fluctuations in a multi-component fermion superfluid
description	Abstract In this work, a Josephson relation is generalized to a multi-component fermion superfluid. Superfluid density is expressed through a two-particle Green function for pairing states. When the system has only one gapless collective excitation mode, the Josephson relation is simplified, which is given in terms of the superfluid order parameters and the trace of two-particle normal Green function. In addition, it is found that the matrix elements of two-particle Green function is directly related to the matrix elements of the pairing fluctuations of superfluid order parameters. Furthermore, in the presence of inversion symmetry, the superfluid density is given in terms of the pairing fluctuation matrix. The results of the superfluid density in Haldane model show that the generalized Josephson relation can be also applied to a multi-band fermion superfluid in lattice.
format	article
author	Yi-Cai Zhang
author_facet	Yi-Cai Zhang
author_sort	Yi-Cai Zhang
title	Superfluid density, Josephson relation and pairing fluctuations in a multi-component fermion superfluid
title_short	Superfluid density, Josephson relation and pairing fluctuations in a multi-component fermion superfluid
title_full	Superfluid density, Josephson relation and pairing fluctuations in a multi-component fermion superfluid
title_fullStr	Superfluid density, Josephson relation and pairing fluctuations in a multi-component fermion superfluid
title_full_unstemmed	Superfluid density, Josephson relation and pairing fluctuations in a multi-component fermion superfluid
title_sort	superfluid density, josephson relation and pairing fluctuations in a multi-component fermion superfluid
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/be6630bdfdf146c882bd312568288817
work_keys_str_mv	AT yicaizhang superfluiddensityjosephsonrelationandpairingfluctuationsinamulticomponentfermionsuperfluid
_version_	1718429312247398400

Superfluid density, Josephson relation and pairing fluctuations in a multi-component fermion superfluid

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