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Exchange-induced splitting of radiative exciton levels in a single quantum wire |
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| Authors: | T Guillet V Voliotis R Grousson R Ferreira X L Wang M Ogura |
| Institution: | a Groupe de Physique des Solides, CNRS, Universités Pierre et Marie Curie et Denis Diderot, 2 place Jussieu, F-75251 Paris Cedex 05, France;b Université Evry-Val d'Essonne, boulevard François Mitterand, 91025 Evry Cedex, France;c Laboratoire de Physique de la Matière Condensée, Ecole Normale Supérieure, CNRS, Universités Pierre et Marie Curie et Denis Diderot, 24 rue Lhomond, F-75005 Paris, France;d Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba 305, Japan;e CREST, Japan Science and Technology, 4-1-8 Honcho, Kawagushi 332-0012, Japan |
| Abstract: | We report on polarization-resolved micro-photoluminescence experiments performed on a single GaAs/GaAlAs V-shaped quantum wire. At low temperature the micro-photoluminescence spectra are composed of sharp peaks corresponding to excitons localized in naturally formed quantum boxes. We observed splittings of the radiative doublet of these exciton levels into two linearly polarized states due to the exchange interaction. The exchange splittings are of the order of 100 μeV. A theoretical model of the exchange interaction on localized states in quantum wires is developed. It shows that the exchange splitting is characteristic of the uniaxial anisotropy of the localized states and thus related to their extension along the wire axis. The experimental results are discussed within the frame of this model. |
| Keywords: | Quantum wire Exchange interaction Micro-photoluminescence |
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