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Title
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Multiband calculation of exciton diamagnetic shift in InP/InGaP self-assembled quantum dots
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Author
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Abstract
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| Exciton states in self-assembled InP/In0.49Ga0.51P quantum dots subject to magnetic fields up to 50T are calculated. Strain and band mixing are explicitly taken into account in the single-particle models of the electronic structure, while an exact diagonalization approach is adopted to compute the exciton states. Reasonably good agreement with magneto-photoluminescence measurements on InP self-assembled quantum dots is found. As a result of the polarization and angular momentum sensitive selection rules, the exciton ground state is dark. For in-plane polarized light, the magnetic field barely affects the exciton spatial localization, and consequently the exciton oscillator strength for recombination increases only slightly with increasing field. For z polarized light, a sharp increase of the oscillator strength beyond 30 T is found which is attributed to the enhanced s character of the relevant portion of the exciton wave function. (C) 2004 Elsevier B.V. All rights reserved. |
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Language
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English
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Source (journal)
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Physica. E: Low-dimensional systems and nanostructures. - Amsterdam
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Source (book)
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3rd International Conference on Quantum Dots (QD 2004), MAY 10-13, 2004, Max Bell Bldg Banff Ctr, Banff, Canada
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Publication
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Amsterdam
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North-Holland
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2005
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ISSN
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1386-9477
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DOI
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10.1016/J.PHYSE.2004.08.101
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Volume/pages
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26
:1-4
(2005)
, p. 212-216
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ISI
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000227249000045
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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