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Related Experiment Video

Updated: Jan 11, 2026

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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Magnet-Free Nonreciprocal Edge Plasmons in Optically Pumped Bilayer Graphene.

Seongjin Ahn1

  • 1Department of Physics, Chungbuk National University, Cheongju 28644, Republic of Korea.

Nanomaterials (Basel, Switzerland)
|November 12, 2025
PubMed
Summary

Bilayer graphene exhibits enhanced nonreciprocal edge plasmons, requiring less optical pump power than monolayer graphene. This positions bilayer graphene as a promising platform for magnet-free nonreciprocal plasmonics.

Keywords:
Wiener–Hopf methodbilayer grapheneplasmonics

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Plasmonics

Background:

  • Gapped Dirac materials, like graphene, can host nonreciprocal edge plasmons when optically pumped.
  • Valley population imbalance in these materials drives nonreciprocal plasmon dispersion.

Purpose of the Study:

  • To investigate nonreciprocal edge plasmon modes in Bernal-stacked bilayer graphene.
  • To compare the nonreciprocity and required pump amplitude in bilayer graphene with monolayer systems.
  • To explore the potential of bilayer graphene for magnet-free nonreciprocal plasmonics.

Main Methods:

  • Theoretical analysis using the Wiener-Hopf method.
  • Computation of exact edge plasmon dispersion, confinement length, and electric potential.
  • Modeling optically pumped gapped bilayer graphene.

Main Results:

  • Bilayer graphene demonstrates stronger nonreciprocity in edge plasmons compared to monolayer graphene.
  • Achieving plasmon splitting in bilayer graphene requires approximately one order of magnitude lower pump amplitude.
  • Gate-tunable energy gap in bilayer graphene offers additional control over plasmon properties.

Conclusions:

  • Bernal-stacked bilayer graphene is a highly effective platform for generating nonreciprocal edge plasmons.
  • The enhanced nonreciprocity and lower required pump power make bilayer graphene advantageous for plasmonic applications.
  • Optically pumped bilayer graphene offers a versatile, magnet-free approach to nonreciprocal plasmonics.