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SUMMARY:Generating and Classifying Turbulence in Bose-Einstein condensates
  - Allen\, J (Newcastle University)
DTSTART:20121203T121000Z
DTEND:20121203T123000Z
UID:TALK41781@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Vortices are a hallmark signature of a turbulent flow. Quantum
  vortices differ from their classical counterparts because of the quantiza
 tion of circulation in superfluid flow. This means that the rotational mot
 ion of a superfluid is constrained to discrete vortices which all have the
  same core structure. Turbulence in superfluid Helium has been the subject
  of many recent experimental and theoretical investigations recently revie
 wed by Skrbek and Sreenivasan [1]. Recently\, experimentalists have been a
 ble to visualise individual vortex lines and reconnection events using tra
 cer particles[2]. Weakly interacting Bose-Einstein condensates present a u
 nique opportunity to resolve the structure of vortices and in turn study t
 he dynamics of a vortex tangle (as has recently been created in an atomic 
 cloud[3]). \n\nWe investigate ways of generating turbulence in atomic syst
 ems by numerically stirring the condensate using a Gaussian 'spoon' (analo
 gous to a laser beam in the experiments)\, and study the isotrophy of the 
 resulting vortex tangle depending on when the path the spoon stirs is circ
 ular or random. We model the system using the Gross-Pitaevskii Equation. \
 n\n[1] L. Skrbek and K.R. Sreenivasan\, PoF 24\, 011301 (2012) [2] G.P. Be
 wley et al. PNAS 105\, 13707 (2008). [3] E.A.L. Henn et al. PRL 103\, 0430
 1 (2009). \n
LOCATION:Seminar Room 1\, Newton Institute
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