Landau level-phonon resonances in graphene and their spectroscopic signatures in magneto-optical measurements

ORAL

Abstract

The excited states and the optical spectra of a two-dimensional electronic system under a magnetic field are strongly influenced by the electron-phonon interaction when the energy spacing of the Landau levels is resonant with the frequency of an optical phonon. We have performed a theoretical study of these excited states in graphene, and have calculated the optical absorption spectra for a range of magnetic fields. Electron-electron interactions are found to redistribute the spectral weight of the coupled modes and have important consequences for the absorption spectra. Our results are in good agreement with recent magneto-optical transmission experiments on epitaxial graphene on SiC. This work was supported by NSF Grant No. DMR10-1006184 and U.S. DOE Contract No. DE- AC02-05CH11231.

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Authors

  • Liang Tan

    • Department of Physics, University of California at Berkeley, and Materials Sciences Division, Lawrence Berkeley National Lab
    • Department of Physics, University of California at Berkeley

  • Cheol-Hwan Park

    • Department of Materials, University of Oxford
    • UC Berkeley
    • University of California, Berkeley

  • Gerard Martinez

    • LNCMI, CNRS, Grenoble, France
    • Laboratoire National des Champs Magetiques Intenses, CNRS

  • Steven G. Louie

    • University of California, Berkeley and Lawrence Berkeley National Laboratory
    • Department of Physics, University of California at Berkeley, and Materials Sciences Division, Lawrence Berkeley National Lab
    • UC Berkeley
    • Department of Physics, U. C. Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory
    • University of California at Berkeley and Lawrence Berkeley National Laboratory
    • University of California-Berkeley and Lawrence Berkeley National Lab
    • Department of Physics, University of California at Berkeley
    • Phys Dept. UC Berkeley
    • Department of Physics, University of California, Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
    • University of California at Berkeley and Lawrence Berkeley National Lab