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SUMMARY:Exciton Condensation - Prof. P. B. Littlewood\,  Cavendish Laborat
 ory\, University of  Cambridge
DTSTART:20060508T141500Z
DTEND:20060508T151500Z
UID:TALK4938@talks.cam.ac.uk
CONTACT:K DAS GUPTA
DESCRIPTION:By shining light on a semiconductor\, one creates pairs of ele
 ctrons and holes that bind together with the Coulomb interaction to make a
 \nneutral ``atom'' called an exciton ---\nthe solid state analog of positr
 onium.\nThe possibility that a gas of excitons might undergo Bose-Einstein
  condensation was raised over 40 years ago.\n\nThough no unequivocal demon
 stration of excitonic BEC has been given in traditional exciton systems\, 
 the phenomenon is related to new quantum\nphases that have been observed\n
 in quantum Hall bilayers\, and some quantum spin systems\, and quite possi
 bly\nrecently in exciton polaritons (which are a resonance between exciton
  and\nphoton in a strongly coupled optical microcavity).\n\nMy talk will f
 ocus on explaining the basic ideas\, reviewing the connections\nbetween di
 fferent experimental systems\, and discussing the most recent\nexperiments
  on exciton polaritons.\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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