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Dimensionality Effect on Exceptional Fermionic Superfluidity with Spin-Dependent Asymmetric Hopping.

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Title: Dimensionality Effect on Exceptional Fermionic Superfluidity with Spin-Dependent Asymmetric Hopping.
Authors: Takemori, Soma1 (AUTHOR) takemori.s.041d@m.isct.ac.jp, Yamamoto, Kazuki1 (AUTHOR), Koga, Akihisa1 (AUTHOR)
Source: Journal of Low Temperature Physics. Feb2026, Vol. 222 Issue 1, p1-11. 11p.
Subjects: Hubbard model, Superfluidity
Abstract: Non-Hermitian (NH) quantum systems host exceptional points (EPs), where eigenstates and eigenvalues coalesce, leading to unconventional many-body phenomena absent in Hermitian systems. While NH fermionic systems with complex interactions exhibit superfluid (SF) breakdown with EPs, spin-dependent asymmetric hopping can stabilize a NH superfluid (NH-SF) that coexists with EPs. In this work, we investigate the quasi-one-dimensional NH attractive Fermi-Hubbard model by using NH-BCS theory. We demonstrate that, when the system is regarded as weakly-coupled chains, the exceptional SF phase becomes unstable and metastable (exceptional) SF state appears between the stable SF and normal states. In the one-dimensional limit, the exceptional SFs disappear entirely and EPs only appear on the phase boundary between the normal and SF states. These results reveal how dimensional crossover governs the stability of the exceptional SF, providing the insights into the interplay between dimensionality and dissipation, with potential relevance for experimental implications in ultracold atoms. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Low Temperature Physics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 191342534
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PubTypeId: academicJournal
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  Data: Dimensionality Effect on Exceptional Fermionic Superfluidity with Spin-Dependent Asymmetric Hopping.
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  Data: <searchLink fieldCode="AR" term="%22Takemori%2C+Soma%22">Takemori, Soma</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> takemori.s.041d@m.isct.ac.jp</i><br /><searchLink fieldCode="AR" term="%22Yamamoto%2C+Kazuki%22">Yamamoto, Kazuki</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Koga%2C+Akihisa%22">Koga, Akihisa</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Low+Temperature+Physics%22">Journal of Low Temperature Physics</searchLink>. Feb2026, Vol. 222 Issue 1, p1-11. 11p.
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  Data: Non-Hermitian (NH) quantum systems host exceptional points (EPs), where eigenstates and eigenvalues coalesce, leading to unconventional many-body phenomena absent in Hermitian systems. While NH fermionic systems with complex interactions exhibit superfluid (SF) breakdown with EPs, spin-dependent asymmetric hopping can stabilize a NH superfluid (NH-SF) that coexists with EPs. In this work, we investigate the quasi-one-dimensional NH attractive Fermi-Hubbard model by using NH-BCS theory. We demonstrate that, when the system is regarded as weakly-coupled chains, the exceptional SF phase becomes unstable and metastable (exceptional) SF state appears between the stable SF and normal states. In the one-dimensional limit, the exceptional SFs disappear entirely and EPs only appear on the phase boundary between the normal and SF states. These results reveal how dimensional crossover governs the stability of the exceptional SF, providing the insights into the interplay between dimensionality and dissipation, with potential relevance for experimental implications in ultracold atoms. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Low Temperature Physics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1007/s10909-026-03372-0
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      – Code: eng
        Text: English
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        PageCount: 11
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      – SubjectFull: Hubbard model
        Type: general
      – SubjectFull: Superfluidity
        Type: general
    Titles:
      – TitleFull: Dimensionality Effect on Exceptional Fermionic Superfluidity with Spin-Dependent Asymmetric Hopping.
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            NameFull: Takemori, Soma
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            NameFull: Yamamoto, Kazuki
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              Text: Feb2026
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              Y: 2026
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