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Inversion of exciton level splitting in quantum dots

Young, R J and Stevenson, R M and Shields, A J and Atkinson, P and Cooper, K and Ritchie, D A and Groom, K M and Tartakovskii, A I and Skolnick, M S (2005) Inversion of exciton level splitting in quantum dots. Physical Review B, 72 (11). -. ISSN 1098-0121

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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.

Item Type: Article
Journal or Publication Title: Physical Review B
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 54929
Deposited By: ep_importer_pure
Deposited On: 07 Jun 2012 12:41
Refereed?: Yes
Published?: Published
Last Modified: 05 Sep 2014 18:12
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/54929

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