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CATEGORIES:Theory of Condensed Matter
SUMMARY:Non-Fermi-liquid behaviour in nearly ferromagnetic
metals: a new fixed point - Dr Chris Hooley\, Uni
versity of St Andrews
DTSTART;TZID=Europe/London:20150115T141500
DTEND;TZID=Europe/London:20150115T151500
UID:TALK53922AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/53922
DESCRIPTION:The topic of this talk is the non-Fermi-liquid reg
ion that appears in two-dimensional metals in the
vicinity of a ferromagnetic quantum critical point
. After a brief introduction to the (long) histor
y of this problem\, I will summarise the results o
f our recent calculation\, which is performed usin
g the functional renormalisation group (fRG) techn
ique. The new feature that this allows us to expl
ore is whether the damping rate of a magnetic fluc
tuation can depend on the wavevector differently t
han it does in a perturbative calculation. We sha
ll find that it can\; indeed\, our fRG analysis yi
elds a fixed point at which the fermions are non-F
ermi-liquid (with a dynamical exponent z_f = 7/6)
and the magnetic fluctuations have a damping rate
that goes like the cube root of their wavevector r
ather than the usual linear behaviour. I will dis
cuss the implications of this finding\, as well as
potential avenues for future work on the problem.
\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
CONTACT:Gareth Conduit
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