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SUMMARY:Universal dynamics of a degenerate unitary Bose gas - Deborah Jin 
 (JILA\, NIST and University of Colorado\, Boulder)
DTSTART:20141015T143000Z
DTEND:20141015T160000Z
UID:TALK55264@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:Strongly interacting many-body systems at or near quantum dege
 neracy are a rich source of intriguing phenomena. The microscopic structur
 e of the first-discovered quantum fluid\, superfluid liquid helium\, is di
 fficult to access owing to limited experimental probes. Although an ultrac
 old atomic Bose gas with tuneable interactions (characterised by its scatt
 ering length\, a) had been proposed as an alternative strongly interacting
  Bose system\, experimental progress has been limited by its short lifetim
 e. Here we present time-resolved measurements of the momentum distribution
  of a Bose-condensed gas that is suddenly jumped to unitarity\, where a is
  infinite. Contrary to expectation\, we observe that the gas lives long en
 ough to permit the momentum to evolve to a quasi-steady-state distribution
 \, consistent with universality\, while remaining degenerate. Investigatio
 ns of the time evolution of this unitary Bose gas may lead to a deeper und
 erstanding of quantum many-body physics
LOCATION:HEP Seminar Room (980) Rutherford Building\, Cavendish Laboratory
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