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SUMMARY:Pair condensation in a strongly interacting 2D Fermi gas - Andre W
 enz (Heidelberg University)
DTSTART:20141024T100000Z
DTEND:20141024T110000Z
UID:TALK55454@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:We present our recent progress on the exploration of the phase
  transition from a normal to a condensed phase in a strongly interacting t
 wo-dimensional Fermi gas. We use a matter-wave focusing technique to direc
 tly access the momentum distribution of the system and observe the emergen
 ce of a condensate at low temperatures. We obtain the phase diagram of the
  two-dimensional Fermi gas in the BEC-BCS crossover by tuning the temperat
 ure and the interaction strength of the system.\nFrom the momentum distrib
 ution\, we extract the g1 correlation function of the sample which clearly
  shows a region of algebraically decaying phase coherence for scales excee
 ding the thermal correlation length. This is consistent with the theoretic
 al predictions for a Berezinsky–Kosterlitz–Thouless (BKT)-like phase. 
 This observation is further supported by a self-interference measurement w
 hich also exhibits quasi long-range phase coherence.\n
LOCATION:Rutherford building\, Seminar Room B
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