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SUMMARY:Universal non-linear conductivity near to an itinerant-electron qu
 antum critical point - Dr. Andrew Green\, University of St Andrews
DTSTART:20071025T131500Z
DTEND:20071025T144500Z
UID:TALK8467@talks.cam.ac.uk
CONTACT:Joe Bhaseen
DESCRIPTION:The vanishing energy scales near to a quantum critical point l
 eave a\nsystem susceptible to being driven out of thermal equilibrium by\n
 external probes\, when the energy scale of the probe scale exceeds the\nte
 mperature. Usually\, non-equilibrium distributions are not universal.\nHow
 ever\, when a quantum critical system is driven into a \nnon-equilibrium s
 teady state\, it may show universal behaviour. The form\nof a non-equilibr
 ium steady state is largely determined by dynamics.\nThe quantum critical 
 state exhibits universality in temporal as well as\nspatial correlation. T
 his universality in dynamics\, then may reveal\nitself in the form of the 
 non-equilibrium distribution. We show as a\nresult that the universal\, po
 wer-law temperature dependence in\nresistivity of an itinerant-electron qu
 antum critical magnet may be\nreflected in a universal non-linear conducti
 vity \; when a strong\nelectric field is applied\, the\nresulting current 
 has a universal power-law dependence upon the\napplied electric field.\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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