Plasmonic Effects in Twisted Bilayer Graphene

ORAL

Abstract

Twisted bilayer graphene, consisting of two monolayer graphene sheets rotated relative to each other, has a unique electronic band structure distinguished by the appearance of van Hove singularities and sensitive dependence on the twist angle. When compared to bernal-stacked bilayer graphene, the presence of van Hove singularities is expected to strongly modify the dispersion of surface plasmon polaritons leading to additional damping pathways and collective excitonic modes called interband plasmons. In this work, we use scattering scanning near-field optical microscopy to launch and image surface plasmon polaritons and shed new light on twisted bilayer graphene.

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Presenters

  • Sai Sunku

    Physics, Columbia University, Columbia Univ, Columbia University

Authors

  • Sai Sunku

    Physics, Columbia University, Columbia Univ, Columbia University

  • GuangXin Ni

    Physics, Univ of California - San Diego, Physics, Columbia University, Columbia University

  • Bor-Yuan Jiang

    Physics, Univ of California - San Diego, Univ of California - San Diego, UC San Diego

  • Hyobin Yoo

    Physics, Harvard University, Harvard University

  • Alexander McLeod

    Columbia University

  • Aaron Sternbach

    Columbia Univ, Columbia University, Physics, Columbia University

  • Philip Kim

    Physics, Harvard University, Harvard University, Department of Physics, Harvard University, Harvard Univ, Physics, Harvard, Department of Physics, Harvard university, School of Applied Sciences and Engineering, Harvard University

  • Michael Fogler

    Physics, Univ of California - San Diego, Department of Physics, University of California San Diego, Univ of California - San Diego, UC San Diego, Physics, University of California, San Diego

  • Dimitri Basov

    Physics, Columbia University, Department of Physics, Columbia University, Columbia Univ, Columbia University