Quantum mechanical repulsion of exciton levels in a disordered quantum well |
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| Authors: | Intonti F Emiliani V Lienau C Elsaesser T Savona V Runge E Zimmermann R Nötzel R Ploog K H |
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| Institution: | Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max-Born-Strasse 2A, D-12489 Berlin, Germany. |
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| Abstract: | Spatially resolved photoluminescence spectra of a single quantum well are recorded by near-field spectroscopy. A set of over four hundred spectra displaying sharp emission lines from localized excitons is subject to a statistical analysis of the two-energy autocorrelation function. An accurate comparison with a quantum theory of the exciton center-of-mass motion in a two-dimensional spatially correlated disordered potential reveals clear signatures of quantum mechanical energy level repulsion, giving the spatial and energetic correlations of excitons in disordered quantum systems. |
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