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