Evident effects of Hofstadter-type energy spectra of modulated bilayer graphene

POSTER

Abstract

When a uniform perpendicular magnetic field is applied to a graphene layer, a two-dimensional periodic scatter array only mixes the Landau levels from the same valley to form split electron-hole Hofstadter-type energy spectra. However, in the case of bilayer graphene, this periodic array is able to mix different sets of Landau levels originating from the two separate valleys. Such a valley mixing effect has been carefully investigated in this work using a projected model Hamiltonian which includes an interlayer effective mass, interlayer coupling and different on-site energies. The computed Hofstadter-type energy spectra and associated density-of-states are employed for further calculations of the ballistic conductance of electrons in bilayer graphene.

Presenters

  • Danhong Huang

    • Air Force Research Lab - Kirtland
    • Physics, University of New Mexico
    • Air Force Research Labs.
    • Kirtland Airforce Base, Air Force Research Laboratory, Albuquerque, NM
    • Advanced E/O Space Sensors Group, Air Force Research Laboratory
    • US Air Force Research Laboratory
    • Space Vehicles Directorate, Kirtland AFB, Air Force Research Laboratory

Authors

  • Danhong Huang

    • Air Force Research Lab - Kirtland
    • Physics, University of New Mexico
    • Air Force Research Labs.
    • Kirtland Airforce Base, Air Force Research Laboratory, Albuquerque, NM
    • Advanced E/O Space Sensors Group, Air Force Research Laboratory
    • US Air Force Research Laboratory
    • Space Vehicles Directorate, Kirtland AFB, Air Force Research Laboratory

  • Andrii Iurov

    • Center for High Technology Materials, University of New Mexico
    • Physics, University of New Mexico
    • University of New Mexico
    • Center for High Technology Materials, University of New Mexico, Albuquerque, NM
    • Center for High Technology, University of New Mexico

  • Godfrey Gumbs

    • Hunter College of the City University of New York, Department of Physics and Astronomy
    • Hunter college
    • Department of Physics & Astronomy, Hunter College of CUNY, New York, NY, USA
    • Hunter College, City University of New York, New York, NY
    • Physics and Astronomy, Hunter College/CUNY
    • Department of Physics and Astronomy, Hunter College of the City University of New York
    • Hunter College, CUNY
    • Physics Department, Hunter College/CUNY

  • Liubov Zhemchuzhna

    • Hunter College of the City University of New York, Department of Physics and Astronomy
    • Hunter college