Abstract
The recent observation of Bose-Einstein condensation (BEC) in ultracoid atoms has stirred a considerable renewal of interest for this effect. A gas of excitons or biexcitons in semiconductors provides another system where BEC has been observed. A particularly interesting aspect of an excitonic Bose-Einstein condensate concerns its propagation in the form of a superfluid. Excitonic superfluidity corresponds to a drag-free, wavelike flow of electronic excitation energy through a crystal
© 1998 Optical Society of America
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