Intralayer and interlayer electron-phonon interactions in twisted bilayer graphene

ORAL

Abstract

In this work we report on the possibility of using resonance Raman spectroscopy to distinguish intralayer and interlayer electron-phonon (el-ph) interactions in twisted bilayer graphene (TBG). This is experimentally attained by tuning the energy of the excitation photon and observing the resonances of the Raman modes in different samples of TBGs. In the intralayer process, the el-ph scattering occurs in a single graphene layer and the other layer imposes a periodic potential that back scatters the excited electron, whereas for the interlayer process the el-ph scattering occurs between states in the Dirac cones of adjacent graphene layers. Our methodology can be extended to study any kind of graphene-based heterostructure. [Eliel et al., Nature Comm. 9, 1221 (2018)]

*This work was supported by the Brazilian Agencies Fapemig, CNPq and CAPES, and by the INCT Nanocarbono.

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Presenters

  • Marcos Pimenta

    • Universidade Federal de Minas Gerais
    • Departamento de Fisica, UFMG, Brazil

Authors

  • Marcos Pimenta

    • Universidade Federal de Minas Gerais
    • Departamento de Fisica, UFMG, Brazil

  • Ariete Righi

    • Departamento de Fisica, UFMG, Brazil

  • Eliel Gomes da Silva Neto

    • Departamento de Física -ICEx, Universidade Federal de Minas Gerais
    • Departamento de Fisica, UFMG, Brazil

  • Andreij de Carvalho Gadelha

    • Departamento de Fisica, UFMG, Brazil
    • Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, 30123-970, Brasil

  • Leonardo Cristiano Campos

    • Departamento de Fisica, UFMG, Brazil
    • Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, 30123-970, Brasil

  • Marcus Moutinho

    • Núcleo Multidisciplinar de Pesquisas em Computação (NUMPEX-COMP), Campus Duque de Caxias, Federal University of Rio de Janeiro (UFRJ)
    • ucleo Multidisciplinar de Pesquisas em Computacao - NUMPEX-COMP, Univ. Fed. do Rio de Janeiro
    • Campus de Duque de Caxias, UFRJ, Rio de Janeiro, Brasil

  • Pedro Venezuela

    • Institute of Physics, Fluminense Federal University (UFF)
    • Instituto de Fisica, Universidade Federal Fluminense

  • Po-Wen Chiu

    • EE, National Tsing Hua University