• M. Remeika
  • A.T. Hammack
  • S.V. Poltavtsev
  • L.V. Butov
  • J. Wilkes
  • A.L. Ivanov
  • K.L. Campman
  • M. Hanson
  • A.C. Gossard
We report on the two-beamstudy of indirect excitons in the inner ring in the exciton emission pattern. One laser beam generates the inner ring and a second weaker beam is positioned in the inner ring. The beam positioned in the inner ring is found to locally suppress the exciton emission intensity. We also report on the inner ring fragmentation and formation of multiple rings in the inner ring region. These features are found to originate from a weak spatial modulation of the excitation beam intensity in the inner ring region. The modulation of exciton emission intensity anticorrelateswith themodulation of the laser excitation intensity. The three phenomena—inner ring fragmentation, formation of multiple rings in the inner ring region, and emission suppression by a weak laser beam in the inner ring—have a common feature: a reduction of exciton emission intensity in the region of enhanced laser excitation. This effect is explained in terms of exciton transport and thermalization.
Original languageEnglish
Article number125307
Number of pages9
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number12
DOIs
StatePublished - 2013

    Research areas

  • indirect excitons, coupled quantum wells

ID: 5669622