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Control of fine-structure splitting of individual InAs quantum dots by rapid thermal annealing

Research output: Contribution to journalJournal article

Published

  • D. J. P. Ellis
  • R. M. Stevenson
  • R. J. Young
  • A. J. Shields
  • P. Atkinson
  • D. A. Ritchie

Associated organisational unit

Article number011907
Journal publication date1/01/2007
JournalApplied Physics Letters
Journal number1
Volume90
Number of pages3
Pages-
Original languageEnglish

Abstract

Degeneracy of the bright single exciton spin state is a prerequisite for the production of triggered polarization-entangled photon pairs from the biexciton decay of a quantum dot. Normally, however, the exciton spin states are split due to in-plane asymmetries. Here the authors demonstrate that the exciton splitting of an individual dot can be tuned through zero by thermal annealing. Repeated annealing blueshifts the exciton emission line of the dot, accompanied by a reduction and inversion in polarization splitting. Annealing is also demonstrated to control the detuning between the exciton and biexciton transitions in any selected dot.