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Inversion of the exciton fine structure splitting in quantum dots |
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| Authors: | R.J. Young R.M. Stevenson A.J. Shields P. Atkinson K. Cooper D.A. Ritchie K.M. Groom A.I. Tartakovskii M.S. Skolnick |
| Affiliation: | aToshiba Research Europe Limited, 260 Cambridge Science Park, Cambridge CB4 0WE, UK;bCavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UK;cDepartment of Physics and Astronomy, University of Sheffield, Hounsfield Road, Sheffield S3 7RH, UK |
| Abstract: | The fine structure splitting of exciton state was measured for a large number of single InAs quantum dots in GaAs. It is shown to decrease as the exciton confinement decreases, crucially passing through zero and changing sign. Degeneracy of the exciton spin states is an important step to producing entangled photons from the biexciton cascade. Thermal annealing reduces the exciton confinement and thereby increases the number of degenerate dots in a particular sample. |
| Keywords: | Quantum dots Photoluminescence Rapid thermal annealing Quantum information |
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