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SUMMARY:The Dicke quantum phase transition with a superfluid gas in an opt
 ical cavity - Kristian Baumann\, ETH Zurich
DTSTART:20101028T131500Z
DTEND:20101028T141500Z
UID:TALK26462@talks.cam.ac.uk
CONTACT:Joe Bhaseen
DESCRIPTION:A fundamental concept to describe the collective matter-light 
 interaction is the Dicke model which has been predicted to show an\nintrig
 uing quantum phase transition. We have realized the Dicke quantum phase tr
 ansition in an open system formed by a Bose Einstein condensate coupled to
  an optical cavity\, and observed the emergence of a selforganized superso
 lid phase. The phase transition is driven by infinitely long-ranged intera
 ctions between the condensed atoms. We show that the phase transition is d
 escribed by the Dicke Hamiltonian\, including counter-rotating coupling te
 rms\, and that the supersolid phase is associated with a spontaneously bro
 ken spatial symmetry. The boundary of the phase transition is mapped out i
 n quantitative agreement with the Dicke model.\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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