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Event Detail Information

Event Detail Information

Speaker Monique Combescot - Institut des NanoSciences de Paris
Date Nov 5, 2012
Time 12:00 pm  
Location 190 Engineering Sciences Building
Contact Becky McDuffee
Phone 244-4268
Event type ICMT Seminar
Views 877
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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