Exotic superfluidity and pairing phenomena in atomic Fermi gases in mixed dimensions

Abstract Atomic Fermi gases have been an ideal platform for simulating conventional and engineering exotic physical systems owing to their multiple tunable control parameters. Here we investigate the effects of mixed dimensionality on the superfluid and pairing phenomena of a two-component ultracold...

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Autores principales:	Leifeng Zhang, Yanming Che, Jibiao Wang, Qijin Chen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3335e5b18a5f42109ebf170cf4c6bc3a
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spelling	oai:doaj.org-article:3335e5b18a5f42109ebf170cf4c6bc3a2021-12-02T15:05:10ZExotic superfluidity and pairing phenomena in atomic Fermi gases in mixed dimensions10.1038/s41598-017-13321-32045-2322https://doaj.org/article/3335e5b18a5f42109ebf170cf4c6bc3a2017-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-13321-3https://doaj.org/toc/2045-2322Abstract Atomic Fermi gases have been an ideal platform for simulating conventional and engineering exotic physical systems owing to their multiple tunable control parameters. Here we investigate the effects of mixed dimensionality on the superfluid and pairing phenomena of a two-component ultracold atomic Fermi gas with a short-range pairing interaction, while one component is confined on a one-dimensional (1D) optical lattice whereas the other is in a homogeneous 3D continuum. We study the phase diagram and the pseudogap phenomena throughout the entire BCS-BEC crossover, using a pairing fluctuation theory. We find that the effective dimensionality of the non-interacting lattice component can evolve from quasi-3D to quasi-1D, leading to strong Fermi surface mismatch. Upon pairing, the system becomes effectively quasi-two dimensional in the BEC regime. The behavior of T c bears similarity to that of a regular 3D population imbalanced Fermi gas, but with a more drastic departure from the regular 3D balanced case, featuring both intermediate temperature superfluidity and possible pair density wave ground state. Unlike a simple 1D optical lattice case, T c in the mixed dimensions has a constant BEC asymptote.Leifeng ZhangYanming CheJibiao WangQijin ChenNature 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 Leifeng Zhang Yanming Che Jibiao Wang Qijin Chen Exotic superfluidity and pairing phenomena in atomic Fermi gases in mixed dimensions
description	Abstract Atomic Fermi gases have been an ideal platform for simulating conventional and engineering exotic physical systems owing to their multiple tunable control parameters. Here we investigate the effects of mixed dimensionality on the superfluid and pairing phenomena of a two-component ultracold atomic Fermi gas with a short-range pairing interaction, while one component is confined on a one-dimensional (1D) optical lattice whereas the other is in a homogeneous 3D continuum. We study the phase diagram and the pseudogap phenomena throughout the entire BCS-BEC crossover, using a pairing fluctuation theory. We find that the effective dimensionality of the non-interacting lattice component can evolve from quasi-3D to quasi-1D, leading to strong Fermi surface mismatch. Upon pairing, the system becomes effectively quasi-two dimensional in the BEC regime. The behavior of T c bears similarity to that of a regular 3D population imbalanced Fermi gas, but with a more drastic departure from the regular 3D balanced case, featuring both intermediate temperature superfluidity and possible pair density wave ground state. Unlike a simple 1D optical lattice case, T c in the mixed dimensions has a constant BEC asymptote.
format	article
author	Leifeng Zhang Yanming Che Jibiao Wang Qijin Chen
author_facet	Leifeng Zhang Yanming Che Jibiao Wang Qijin Chen
author_sort	Leifeng Zhang
title	Exotic superfluidity and pairing phenomena in atomic Fermi gases in mixed dimensions
title_short	Exotic superfluidity and pairing phenomena in atomic Fermi gases in mixed dimensions
title_full	Exotic superfluidity and pairing phenomena in atomic Fermi gases in mixed dimensions
title_fullStr	Exotic superfluidity and pairing phenomena in atomic Fermi gases in mixed dimensions
title_full_unstemmed	Exotic superfluidity and pairing phenomena in atomic Fermi gases in mixed dimensions
title_sort	exotic superfluidity and pairing phenomena in atomic fermi gases in mixed dimensions
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/3335e5b18a5f42109ebf170cf4c6bc3a
work_keys_str_mv	AT leifengzhang exoticsuperfluidityandpairingphenomenainatomicfermigasesinmixeddimensions AT yanmingche exoticsuperfluidityandpairingphenomenainatomicfermigasesinmixeddimensions AT jibiaowang exoticsuperfluidityandpairingphenomenainatomicfermigasesinmixeddimensions AT qijinchen exoticsuperfluidityandpairingphenomenainatomicfermigasesinmixeddimensions
_version_	1718388883637403648

Exotic superfluidity and pairing phenomena in atomic Fermi gases in mixed dimensions

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