Electrostatic conveyer for excitons

ORAL

Abstract

We report on the realization of electrostatic conveyers for indirect excitons in GaAs/AlGaAs coupled quantum wells. The conveyer is a laterally moving lattice potential for excitons. Its amplitude and speed can be controlled by laterally modulated oscillating electrode voltages. We observed the exciton transport via the conveyer over several tens of microns and studied the transport as a function of the conveyer amplitude, exciton density, and exciton lifetime. We observed a \textit{dynamical} localization-delocalization transition for the excitons in the conveyer with varying exciton density and conveyer amplitude: In the localization regime, excitons are moved by the conveyer, following the moving lattice potential, while in the delocalized regime, excitons do not follow the conveyer motion.

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Authors

  • A.G. Winbow

    University of California, San Diego

  • J.R. Leonard

    University of California, San Diego

  • M. Remeika

    University of California, San Diego

  • A.A. High

    University of California, San Diego

  • E. Green

    University of California, San Diego

  • A.T. Hammack

    University of California, San Diego

  • L.V. Butov

    University of California, San Diego

  • M. Hanson

    University of California, Santa Barbara

  • A.C. Gossard

    Univeristy of California, Santa Barbara, University of California, Santa Barbara