Many-electron Effects on the Electronic Structure and Optical Spectrum of Few-layer Graphene

ORAL

Abstract

We present a first-principles calculation of the optical properties of single- and few-layer graphene with many-electron effects included, employing the GW-Bethe Salpeter equation (GW- BSE) approach. We have found enhanced excitonic effects that result in significant changes in the optical absorption of few- layer graphene as compared to the independent-particle picture. Our calculated absorption spectrum is in good agreement with recent experiments. This study is of importance for understanding excitonic effects in two-dimensional semimetal systems and expected to be useful for possible optoelectronics applications of graphene.

*This work is supported by National Science Foundation Grant No. DMR07-05941 and the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. Computational resources have been provided by Lonestar of TeraGrid.

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Authors

  • Li Yang

    • The department of Physics, University of California at Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory

  • Jack Deslippe

    • The department of Physics, University of California at Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory
    • University of California at Berkeley and Lawrence Berkeley National Lab

  • Cheol-Hwan Park

    • The department of Physics, University of California at Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory
    • Department of Physics, University of California, Berkeley, California 94720, USA and Materials Science Division, Lawrence Berkeley National Laboratory

  • Marvin L. Cohen

    • The department of Physics, University of California at Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory
    • UC Berkeley, Lawrence Berkeley National Labratory
    • University of California Berkeley
    • Department of Physics, University of California at Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
    • Department of Physics, University of California, Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory
    • Department of Physics, University of California at Berkeley and Materials Sciences Division of Lawrence Berkeley National Laboratory
    • Physics Dept, UC Berkeley
    • University of California, Berkeley and MSD, Lawrence Berkeley National Laboratory

  • Steven G. Louie

    • The department of Physics, University of California at Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory
    • UC Berkeley, Lawrence Berkeley National Labratory
    • University of California Berkeley
    • Department of Physics, University of California at Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
    • Department of Physics, University of California, Berkeley and Lawrence Berkeley National Laboratory
    • Department of Physics, University of California at Berkeley and Materials Sciences Division of Lawrence Berkeley National Laboratory
    • University of California, Berkeley
    • University of California at Berkeley and Lawrence Berkeley National Lab