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SUMMARY:Kinetics and Bose-Einstein condensation of parametrically driven m
 agnons at RT. - Prof. Sergej Demokritov\, Muenster University
DTSTART:20091002T131500Z
DTEND:20091002T141500Z
UID:TALK18675@talks.cam.ac.uk
CONTACT:Dr Jonathan Keeling
DESCRIPTION:\nA gas of bosons can undergo Bose-Einstein condensation even 
 at relatively\nhigh temperatures\, if the flow rate of energy\, pumped int
 o the system\, is\nhigh enough. Following this approach we investigated at
  room temperature\nmagnons in an yttrium iron garnet film\, which are driv
 en by microwave\npumping. We show that for low pumping powers a quasi-equi
 librium magnon\ndistribution described by the Bose-Einstein statistics wit
 h a non-zero\nchemical potential is formed. For higher pumping powers we o
 bserved\nBose-Einstein condensation of magnons and detected a spontaneous 
 emergence\nof coherence in the condensate. We studied the kinetics of pump
 ed magnons\nwith simultaneous resolution with respect to the wave vectors 
 and\nfrequencies\, as well as processes of magnon thermalization leading t
 o the\ncondensation.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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