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Inversion of exciton level splitting in quantum dots

Research output: Contribution to journalJournal article

Published

  • R J Young
  • R M Stevenson
  • A J Shields
  • P Atkinson
  • K Cooper
  • D A Ritchie
  • K M Groom
  • A I Tartakovskii
  • M S Skolnick

Associated organisational unit

Article number113305
Journal publication date09/2005
JournalPhysical Review B
Journal number11
Volume72
Number of pages4
Pages-
Original languageEnglish

Abstract

The demonstration of degeneracy of exciton spin states is an important step toward the production of entangled photon pairs from the biexciton cascade. We measure the fine structure of exciton and biexciton states for a large number of single InAs quantum dots in a GaAs matrix; the energetic splitting of the horizontally and vertically polarized components of the exciton doublet is shown to decrease as the exciton confinement decreases, crucially passing through zero and changing sign. Thermal annealing is shown to reduce the exciton confinement, thereby increasing the number of dots with splitting close to zero.