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SUMMARY:Vortex Dynamics and Turbulence in Confined Quantum Gases - Proukak
 is\, N (Newcastle University)
DTSTART:20121206T144000Z
DTEND:20121206T145500Z
UID:TALK41890@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Quantised vortices are known to arise in ultra-low temperature
  quantum gases as a result of targeted vortex generation (e.g. via phase i
 mprinting or a 'quantum stirrer') or intrinsic system fluctuations. Such v
 ortices interact dynamically\, reconnect and can form regular ('lattices')
  or irregular (turbulent) structures\, depending on the system conditions.
  Focusing initially on the issue of tangled vorticity\, we show that the v
 elocity statistics provides a unique identifier of 'quantum' vs. 'ordinary
 ' turbulence\, in agreement with related studies in helium. As quantum gas
  experiments typically feature harmonic confinement\, one does not have ac
 cess to the broad lengthscales relevant for helium\, with the total number
  of vortices typically constrained from a few to a few hundred. In a first
  attempt to probe 'turbulence' in such systems\, we go beyond the usual pr
 ocedure of looking at the energy spectrum to discuss methods to quantify a
 nd ana lyze the amount of clustering of vortices using information extract
 ed from their position and winding\, focusing here on the two-dimensional 
 regime. As realistic cold atom experiments are conducted at non-zero tempe
 ratures\, where the condensate co-exists with a thermal cloud\, we also st
 udy how temperature modifies the motion of vortices in such systems. \n\nT
 his work has been generously funded by EPSRC.\n
LOCATION:Seminar Room 1\, Newton Institute
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