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SUMMARY:BCS-BEC crossover and polaron-to-molecule transition in strongly i
 nteracting Fermi gases. - Matthias Punk\, TU Munich
DTSTART:20101019T100000Z
DTEND:20101019T110000Z
UID:TALK27400@talks.cam.ac.uk
CONTACT:Dr G Moller
DESCRIPTION:The experimental realization of ultracold quantum gases trigge
 red a new theoretical interest in basic many body systems\, which have not
  been realized in nature previously. One example of a fundamental many bod
 y problem that is now experimentally accessible for the first time is the 
 so called BCS-BEC crossover from weakly bound Cooper pairs to a Bose-Einst
 ein condensate of strongly bound molecules in attractively interacting\, t
 wo-component Fermi gases. In this talk I will give a brief introduction to
  the BCS-BEC crossover\, show recent theoretical results on single particl
 e spectral functions and discuss the controversial issue of a possible pse
 udogap behavior in the strongly interacting system above Tc. Moreover\, I 
 will show how a slight generalization of this model to a situation with a 
 population imbalance between the two Fermionic species gives rise to a ric
 h phase diagram that is poorly understood from a theoretical point of view
 . In particular I'm going to discuss the seemingly simple limit of a singl
 e "down-spin" interacting with a Fermi-sea of "up-spins".
LOCATION:Mott Seminar Room\, Cavendish Laboratory
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