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

Research output: Contribution to journalJournal articlepeer-review

  • D. J. P. Ellis
  • R. M. Stevenson
  • R. J. Young
  • A. J. Shields
  • P. Atkinson
  • D. A. Ritchie
Article number011907
<mark>Journal publication date</mark>1/01/2007
<mark>Journal</mark>Applied Physics Letters
Issue number1
Number of pages3
Pages (from-to)-
Publication StatusPublished
<mark>Original language</mark>English


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.