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ICMT Seminar: "BEC-BCS crossover in excitonic systems"

Event Type
Institute for Condensed Matter Physics
190 Engineering Sciences Building
Nov 5, 2012   12:00 pm  
Monique Combescot - Institut des NanoSciences de Paris
Originating Calendar
Physics - Institute for Condensed Matter Theory Seminar

In the dilute regime, electron-hole pairs form excitons which at low enough temperature undergo Bose-Einstein condensation in a linearly polarized state which is dark, unfortunately.  Trapping a dark condensate, and thus knowing where it is, would greatly help to "see" it. This can be done through standing optical waves - even if dark excitons are not directly coupled to light.  Under a density increase, carrier exchange between excitons brings a bright component to the condensate above a density threshold which may fall in the phase separation domaine between a dilute exciton gas and a dense electron-hole plasma.  BCS condensation of "excitonic Cooper pairs" can take place in the dense plasma, making it superfluid - but not superconductor.

 Exciton physics is definitely quite rich !

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