Regensburg 2007 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 20: Symposium Bose-Einstein Kondensation in Halbleitern

HL 20.3: Hauptvortrag

Dienstag, 27. März 2007, 11:45–12:15, H15

Challenges on the way towards Bose-Einstein condensation of excitons — •Roland Zimmermann — Institut für Physik der Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin

Starting with the ideal Bose gas in a trap, necessary prerequisites for reaching condensation in exciton systems are discussed, and actual experimental attempts are critically reviewed. More details are given on high-density excitons in coupled quantum wells with a lateral trap. Taking into account the strong dipole-dipole repulsion between these spatially indirect excitons, we have implemented a dynamical T matrix approach and present numerical results. The spectral lineshape of the emitted luminescence as well as its angular characteristics provide clear signatures for the approach to condensation which, however, has not been reached yet.