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SUMMARY:Exploring critically at the driven-dissipative Dicke phase transit
 ion - Ferdinand Brennecke (ETH Zurich)
DTSTART:20130617T143000Z
DTEND:20130617T160000Z
UID:TALK45819@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:Coupling motional degrees of freedom of a laser-driven Bose-Ei
 nstein condensate to the quantized field of an optical high-finesse resona
 tor provides a clean model system for studying the driven-dissipative Dick
 e phase transition. In this talk\, I will present recent experimental resu
 lts on the observation of critical behavior and mode softening at this sec
 ond-order phase transition. By monitoring the cavity output field we are a
 ble to observe in real-time the diverging atomic density fluctuations whil
 e approaching the critical point. The observed critical behavior deviates 
 from that expected for the closed Dicke model and is in quantitative agree
 ment with the enhanced fluctuations spectrum of the driven-dissipative sys
 tem. A correlation analysis of the cavity output field reveals the critica
 l slowdown of the system dynamics and allows us to identify an additional 
 dissipation channel for the atomic degrees of freedom
LOCATION:Rutherford building\, Seminar Room B
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