Optical Spectra and Excitonic Effect of Nanostructured Materials

ORAL

Abstract

To investigate the optical spectra and excitonic effect of various nanostructured materials, we solve the Bethe-Salpeter equation (BSE) of the two-particle Green's function employing one-particle input from either GW approximation (GWA) calculations or the empirical pseudopotential method (EPM). We will present a comparative study of results from these two approaches. We will discuss the absorption spectra and excitonic effects of various structures of silicon and carbon materials including nanowires and nanotubes.

*This work is partly supported by ITAMIT, University of Minnesota.

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Authors

  • Young-Kyun Kwon

    • Dept. of Physics, University of California at Berkeley and University of Minnesota
    • University of California, Berkeley and University of Minnesota

  • Catalin D. Spataru

    • University of California, Berkeley, and Lawrence Berkeley National Laboratory

  • James R. Chelikowsky

    • University of Minnesota
    • University of Minnesota, and University of Texas, Austin

  • Marvin L. Cohen

    • Department of Physics, University of California at Berkeley, Berkeley CA 94720
    • UC Berkeley and Lawrence Berkeley National Laboratory
    • University of California at Berkeley and Lawrence Berkeley National Laboratory
    • Phys. Dept./UC Berkeley
    • University of California, Berkeley, and Lawrence Berkeley National Laboratory

  • Steven G. Louie

    • The Molecular Foundry, Lawrence Berkeley National Laboratory and Department of Physics, University of California at Berkeley, Berkeley CA 94720
    • University of California, Berkeley and Lawrence Berkeley National Laboratory
    • Department of Physics, University of California at Berkeley, and the Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
    • University of California, Berkeley, and Lawrence Berkeley National Laboratory