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Fine structure of highly charged excitons in semiconductor quantum dots.

Authors
Type
Published Article
Journal
Physical review letters
Publication Date
Volume
90
Issue
24
Pages
247403–247403
Identifiers
PMID: 12857227
Source
Medline

Abstract

An 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.

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