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Magnet-Free Nonreciprocal Edge Plasmons in Optically Pumped Bilayer Graphene.

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Title: Magnet-Free Nonreciprocal Edge Plasmons in Optically Pumped Bilayer Graphene.
Authors: Ahn, Seongjin1 (AUTHOR)
Source: Nanomaterials (2079-4991). Nov2025, Vol. 15 Issue 21, p1622. 13p.
Subjects: Optical pumping, Graphene, Magnetism, Surface plasmons, Boundary value problems, Band gaps
Abstract: Recent theoretical studies have shown that gapped Dirac materials (such as gapped monolayer graphene) optically pumped with circularly polarized light can host edge-localized plasmon modes with nonreciprocal dispersions driven by valley population imbalance. Here, we extend this framework to Bernal-stacked bilayer graphene. Using the Wiener–Hopf method, we compute the exact edge plasmon dispersion, confinement length, and electric potential. Our results show that bilayer graphene exhibits stronger nonreciprocity in edge plasmons, requiring approximately one order of magnitude lower pump amplitude to achieve splitting compared with monolayer Dirac systems. Furthermore, the gate-tunable energy gap of bilayer graphene provides an additional degree of control, positioning optically pumped bilayer graphene as a versatile platform for magnet-free nonreciprocal plasmonics. [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI 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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  Data: Magnet-Free Nonreciprocal Edge Plasmons in Optically Pumped Bilayer Graphene.
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  Data: <searchLink fieldCode="AR" term="%22Ahn%2C+Seongjin%22">Ahn, Seongjin</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="DE" term="%22Optical+pumping%22">Optical pumping</searchLink><br /><searchLink fieldCode="DE" term="%22Graphene%22">Graphene</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetism%22">Magnetism</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+plasmons%22">Surface plasmons</searchLink><br /><searchLink fieldCode="DE" term="%22Boundary+value+problems%22">Boundary value problems</searchLink><br /><searchLink fieldCode="DE" term="%22Band+gaps%22">Band gaps</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Recent theoretical studies have shown that gapped Dirac materials (such as gapped monolayer graphene) optically pumped with circularly polarized light can host edge-localized plasmon modes with nonreciprocal dispersions driven by valley population imbalance. Here, we extend this framework to Bernal-stacked bilayer graphene. Using the Wiener–Hopf method, we compute the exact edge plasmon dispersion, confinement length, and electric potential. Our results show that bilayer graphene exhibits stronger nonreciprocity in edge plasmons, requiring approximately one order of magnitude lower pump amplitude to achieve splitting compared with monolayer Dirac systems. Furthermore, the gate-tunable energy gap of bilayer graphene provides an additional degree of control, positioning optically pumped bilayer graphene as a versatile platform for magnet-free nonreciprocal plasmonics. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Group: Ab
  Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI 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: 10.3390/nano15211622
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      – Code: eng
        Text: English
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        PageCount: 13
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    Subjects:
      – SubjectFull: Optical pumping
        Type: general
      – SubjectFull: Graphene
        Type: general
      – SubjectFull: Magnetism
        Type: general
      – SubjectFull: Surface plasmons
        Type: general
      – SubjectFull: Boundary value problems
        Type: general
      – SubjectFull: Band gaps
        Type: general
    Titles:
      – TitleFull: Magnet-Free Nonreciprocal Edge Plasmons in Optically Pumped Bilayer Graphene.
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              M: 11
              Text: Nov2025
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              Y: 2025
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            – TitleFull: Nanomaterials (2079-4991)
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