Heinrich Stolz, Rico Schwartz, Frank Kieseling, Sunipa Som, Maria Kaupsch, Siegfried Sobkowiak, Dirk Semkat, Nobuko Naka, Thomas Koch, Holger Fehske
We present experiments on the luminescence of excitons confined in a potential trap at milli-Kelvin bath temperatures under cw-excitation. Furthermore, we discuss the present state of the theoretical description of Bose-Einstein condensation of excitons with respect to signatures of a condensate in the luminescence. Special attention is directed to the spatial profiles of the luminescence intensity and to the totally integrated intensity in dependence on the excitation power. The comparison of the experimental data with theoretical results shows the necessity of taking into account a Bose-Einstein condensed excitonic phase. A careful theoretical analysis of the measurements reveals clear signatures of a Bose-Einstein condensate of excitons both in the spatially resolved as well as in the integrated luminescence intensity.
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http://arxiv.org/abs/1206.7029
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