Low temperature near-field luminescence studies of localized and delocalized excitons in quantum wires |
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Authors: | F. Intonti,V. Emiliani,C. Lienau,T. Elsaesser,R. Nö tzel&dagger , K. H. Ploog&dagger |
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Affiliation: | Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, D-12489 Berlin, Germany;Paul-Drude-Institut für Festkörperelektronik, D-10117 Berlin, Germany |
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Abstract: | Excitons in a GaAs quantum wire were studied in high-resolution photoluminescence experiments performed at a temperature of about 10 K with a spatial resolution of 160 nm and a spectral resolution of 100 µeV. We report the observation of quasi-one-dimensional excitons which are delocalized over a length of up to several micrometres along the quantum wire. Such excitons give rise to a 10 meV broad luminescence band, representing a superposition of transitions between different delocalized states. In addition, we find a set of sharp luminescence peaks from excitons localized on a sub150 nm length scale. Theoretical calculations of exciton states in a disordered quasi-one-dimensional potential reproduce the experimental results. |
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Keywords: | Excitons low temperature near-field microscopy luminescence spectroscopy quantum wire |
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