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Fine Structure of Highly Charged Excitons in Semiconductor Quantum Dots

AuthorsUrbaszek, B.; Warburton, Richard J.; Karrai, Khaled; Gerardot, B. D.; Petroff, Pierre M.; García Martínez, Jorge Manuel
KeywordsSemiconductor quantum dots
Issue Date20-Jun-2003
PublisherAmerican Physical Society
CitationPhysical Review Letters 90, 247403 (2003)
AbstractAn exciton in a symmetric semiconductor quantum dot has two possible states, one dark and one bright, split in energy by the electron-hole exchange interaction. We demonstrate that for a doubly charged exciton, there are also two states split by the electron-hole exchange, but both states are now bright. We also uncover a fine structure in the emission from the triply charged exciton. By measuring these splittings, and also those from the singly charged and doubly charged biexcitons, all on the same quantum dot, we show how the various electron-hole exchange energies can be measured without having to break the symmetry of the dot.
Description4 páginas, 3 figuras, 2 tablas.-- PACS numbers: 78.55.Cr, 71.70.Gm, 73.21.La, 78.67.Hc
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.90.247403
Appears in Collections:(IMN-CNM) Artículos
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