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SUMMARY:Incoherent transport in clean quantum critical metals - Blaise Gou
 téraux
DTSTART:20151217T130000Z
DTEND:20151217T140000Z
UID:TALK61004@talks.cam.ac.uk
CONTACT:Dr. Piotr Tourkine
DESCRIPTION:In a clean quantum critical metal\, and in the absence of umkl
 app\, most \nd.c. conductivities are formally infinite due to momentum \nc
 onservation.  However\, there is a particular combination of the charge \n
 and heat currents which has a finite\, universal conductivity. In this \nt
 alk\, I will describe the physics of this conductivity  in quantum \ncriti
 cal metals obtained by charge doping a strongly interacting \nconformal fi
 eld theory. I will show that it satisfies an Einstein \nrelation and contr
 ols the diffusivity of a conserved charge in the \nmetal. I will compute i
 t in a class of theories with  holographic \ngravitational duals. Finally\
 , I will show how its temperature scaling of \ndepends on certain critical
  exponents characterizing the quantum \ncritical metal. The holographic re
 sults are found to be reproduced by \nthe scaling analysis\, with the char
 ge density operator\nbecoming marginal in the emergent low energy quantum 
 critical theory.
LOCATION:Potter Room (first floor\, Pav. B)
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