Inversion of exciton level splitting in quantum dots

Young, R.J., Stevenson, R.M., Shields, A.J., Atkinson, P., Cooper, K., Ritchie, D.A., Groom, K.M., Tartakovskii, A.I. and Skolnick, M.S. (2005) Inversion of exciton level splitting in quantum dots. Physical Review B: Condensed Matter and Materials Physics, 72 (11). p. 113305. 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
Copyright, Publisher and Additional Information:	© 2005 The American Physical Society. Reproduced in accordance with the publisher’s self-archiving policy.
Academic Units:	The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Computer Science (Sheffield)
Depositing User:	Repository Assistant
Date Deposited:	27 Jul 2006
Last Modified:	08 Feb 2013 16:49
Published Version:	http://dx.doi.org/10.1103/PhysRevB.72.113305
Status:	Published
Publisher:	American Institute of Physics
Refereed:	Yes
Identification Number:	10.1103/PhysRevB.72.113305
URI:	http://eprints.whiterose.ac.uk/id/eprint/1461

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