Investigation of the optical gap in Ge nanowires.

ORAL

Abstract

We investigate the role of quantum confinement for the optical and electronic properties of Ge nanowires.~ Real space pseudopotentials constructed within density functional theory were used to solve the electronic structure problem.~ We predict the quasi-particle and optical gaps as a function of the diameter up to approximately 3 nm for wires oriented along the (110) and (111) directions.~ We compare our results to previous work on Si wires.~

*Financial support by DOE under grants DE-FG02-03ER25585/15491, NSF grant DMR-0551195. Computational resources provided by the Texas Advanced Computing Center (TACC)

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Authors

  • Jiaxin Han

    • The University of Texas at Austin

  • S. P. Beckman

    • The University of Texas at Austin

  • James Chelikowsky

    • University of Texas at Austin
    • University of Texas
    • The University of Texas at Austin
    • Department of Physics and Chemical Engineering, Institute of Computational Engineering and Sciences, University of Texas, Austin, Texas 78712, USA