Infrared absorptions in gate-tuned twisted bilayer graphene

POSTER

Abstract

We show that the infrared transmission spectrum of electrically gated twisted bilayer graphene (TBG) manifests dramatic changes such as the splitting of the interlinear-band absorption step, the shift of the inter-van Hove singularity transition peak, and the emergence of a very strong intravalence (intraconduction) band transition. These anomalous optical behaviors demonstrate that non-rigid band econstruction occurs by the ion-gel gating due to layer-dependent Coulomb screening that is confirmed by our band structure calculations. We discuss the implications of such effect on the superconductivity of TBG , and also on possible applications as electrooptical device.

Presenters

  • Eunjip Choi

    • Univ of Seoul
    • Physics, University of Seoul

Authors

  • kwangnam yu

    • Univ of Seoul

  • Nguyen Van Luan

    • Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Sungkyunkwan University

  • Taesoo Kim

    • Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Sungkyunkwan University

  • Jiwon Jeon

    • Univ of Seoul
    • Physics, University of Seoul

  • Jiho kim

    • Univ of Seoul
    • Physics, University of Seoul

  • Pilkyung Moon

    • New York University Shanghai and NYU-ECNU Institute of Physics at NYU Shanghai, Shanghai, China
    • New York University Shanghai and NYU-ECNU Institute of Physics at NYU Shanghai
    • Arts and Sciences, NYU Shanghai

  • Young-Hee Lee

    • Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Sungkyunkwan University
    • IBS Center for Integrated Nanostructure Physics, Institute for Basic Science, Sungkyunkwan University
    • Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Korea

  • Eunjip Choi

    • Univ of Seoul
    • Physics, University of Seoul