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Event

Tuesday, 29 September, 2015

Bose-Einstein condensation of excitons: Any light at the end of the tunnel?

Prof. Francois Dubin, Pierre and Marie Curie University Paris. France

Tuesday, September 29, 2015, 13:00 h

ZNN, Seminar room EG 0.001, Garching

Abstract:

Predicted in the 1960's, Bose-Einstein condensation (BEC) of semiconductor excitons remains anopen question both theoretically and experimentally. This situation was not foreseen since excitonsare light mass quasi-particles made by a Coulomb bound electron-hole pair. BEC is thus expected tooccur below a few Kelvins, i.e. directly accessible with standard cryogeny. Nevertheless, it has so farnot be signalled by the long expected strong photoluminescence emitted by a condensed populationof low energy bright excitons. Indeed, recent theoretical works have pointed out that the excitonsground-state being optically inactive, i.e. dark, BEC has then to be signalled by a macroscopicpopulation of dark excitons]. These can naturally not be directly resolved optically. Here, I will reportrecent experiments that indicate a dark state condensation of excitons. These are performed in amicroscopic trap where the overall exciton density is kept constant while the bath temperature isvaried. Thus, quantum statistical signatures are resolved and the quantum phase transition ismapped accurately.

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