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CATEGORIES:Semiconductor Physics
SUMMARY:Exciton Condensation - Prof. P. B. Littlewood\,  C
 avendish Laboratory\, University of  Cambridge
DTSTART;TZID=Europe/London:20060508T151500
DTEND;TZID=Europe/London:20060508T161500
UID:TALK4938AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/4938
DESCRIPTION:By shining light on a semiconductor\, one creates 
 pairs of electrons and holes that bind together wi
 th the Coulomb interaction to make a\nneutral ``at
 om'' called an exciton ---\nthe solid state analog
  of positronium.\nThe possibility that a gas of ex
 citons might undergo Bose-Einstein condensation wa
 s raised over 40 years ago.\n\nThough no unequivoc
 al demonstration of excitonic BEC has been given i
 n traditional exciton systems\, the phenomenon is 
 related to new quantum\nphases that have been obse
 rved\nin quantum Hall bilayers\, and some quantum 
 spin systems\, and quite possibly\nrecently in exc
 iton polaritons (which are a resonance between exc
 iton and\nphoton in a strongly coupled optical mic
 rocavity).\n\nMy talk will focus on explaining the
  basic ideas\, reviewing the connections\nbetween 
 different experimental systems\, and discussing th
 e most recent\nexperiments on exciton polaritons.\
 n
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Departm
 ent of Physics
CONTACT:K DAS GUPTA
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