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

Ellis, D. J. P. and Stevenson, R. M. and Young, R. J. and Shields, A. J. and Atkinson, P. and Ritchie, D. A. (2007) Control of fine-structure splitting of individual InAs quantum dots by rapid thermal annealing. Applied Physics Letters, 90 (1). -. ISSN 0003-6951

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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.

Item Type: Article
Journal or Publication Title: Applied Physics Letters
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 54922
Deposited By: ep_importer_pure
Deposited On: 07 Jun 2012 12:27
Refereed?: Yes
Published?: Published
Last Modified: 09 Apr 2014 23:37
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/54922

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