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SUMMARY:Non-Fermi-liquid behaviour in nearly ferromagnetic metals: a new f
 ixed point - Dr Chris Hooley\, University of St Andrews 
DTSTART:20150115T141500Z
DTEND:20150115T151500Z
UID:TALK53922@talks.cam.ac.uk
CONTACT:Gareth Conduit
DESCRIPTION:The topic of this talk is the non-Fermi-liquid region that app
 ears in two-dimensional metals in the vicinity of a ferromagnetic quantum 
 critical point.  After a brief introduction to the (long) history of this 
 problem\, I will summarise the results of our recent calculation\, which i
 s performed using the functional renormalisation group (fRG) technique.  T
 he new feature that this allows us to explore is whether the damping rate 
 of a magnetic fluctuation can depend on the wavevector differently than it
  does in a perturbative calculation.  We shall find that it can\; indeed\,
  our fRG analysis yields a fixed point at which the fermions are non-Fermi
 -liquid (with a dynamical exponent z_f = 7/6) and the magnetic fluctuation
 s have a damping rate that goes like the cube root of their wavevector rat
 her than the usual linear behaviour.  I will discuss the implications of t
 his finding\, as well as potential avenues for future work on the problem.
 \n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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