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Topological edge modes in multilayer graphene systems.

Lixin Ge, Li Wang, Meng Xiao

    Optics Express
    |September 15, 2015
    PubMed
    Summary

    Topological edge plasmon modes emerge in multilayer graphene systems. These modes, analogous to electronic systems, exhibit invariant dispersion and can be tuned by electrical gating or chemical doping.

    Area of Science:

    • Condensed matter physics
    • Plasmonics
    • Materials science

    Background:

    • Collective oscillations of Dirac electrons in graphene support plasmons.
    • Tight-binding models accurately describe graphene plasmons due to strong field confinement.

    Purpose of the Study:

    • Investigate topological properties of plasmonic bands in multilayer graphene.
    • Explore the emergence and characteristics of topological edge plasmon modes.

    Main Methods:

    • Utilized a tight-binding model for graphene plasmons.
    • Calculated Zak phases for periodic graphene sheet arrays.
    • Analyzed the connection of arrays with different Zak phases.

    Main Results:

    • Topological edge plasmon modes emerge when connecting graphene arrays with different Zak phases.

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  • The dispersion of these edge modes is invariant to geometric parameters (separation, period).
  • Dispersion matches that of monolayer graphene.

    • Conclusions:

    • Multilayer graphene systems exhibit tunable topological edge plasmon states.
    • Electrical gating and chemical doping offer pathways for tuning these plasmonic states.