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Coulomb correlations evidenced in the magneto-optical spectra of charged excitons in semiconductor quantum dots

By D. Y. Oberli, M. Byszewski, B. Chalupar, E. Pelucchi, A. Rudra and E. Kapon

Abstract

The emission spectral pattern of a charged exciton in a semiconductor quantum dot is composed of a quadruplet of linearly polarized lines in the presence of a magnetic field oriented perpendicularly to the direction of the photon momentum. By measuring the Zeeman splittings, we obtain the effective g factors of the carriers and find that the hole g factor is very sensitive to the QD shape asymmetry. By comparing the effective g factors obtained for the neutral and the charged excitons in the same quantum dot, we uncover the role of Coulomb correlations in these excitonic states.Comment: 16 pages; 3 figures; v2: corrected for error in Zeeman Hamiltonian; quality of figures was improved

Topics: Condensed Matter - Materials Science
Year: 2009
OAI identifier: oai:arXiv.org:0811.4117

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