Fine structure of negatively and positively charged excitons in semiconductor Quantum dots: Electron-hole asymmetry

M. Ediger, G. Bester, B. D. Gerardot, A. Badolato, P. M. Petroff, K. Karrai, A. Zunger, R. J. Warburton

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

We present new understanding of excitonic fine structure in close-to-symmetric InAs/GaAs and InGaAs/GaAs quantum dots. We demonstrate excellent agreement between spectroscopy and many-body pseudopotential theory in the energy splittings, selection rules and polarizations of the optical emissions from doubly charged excitons. We discover a marked difference between the fine structure of the doubly negatively and doubly positively charged excitons. The features in the doubly charged emission spectra are shown to arise mainly from the lack of inversion symmetry in the underlying crystal lattice. © 2007 The American Physical Society.

Original languageEnglish
Article number036808
Pages (from-to)-
Number of pages4
JournalPhysical Review Letters
Volume98
Issue number3
DOIs
Publication statusPublished - 19 Jan 2007

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