An emergent Fermi Liquid from a strongly coupled quantum critical point

KTH/Nordita/SU seminar in Theoretical Physics [before December 2013]

Wednesday 27 January 2010
from 11:00
to 12:00 at
FA31

Speaker :

Koenraad Schalm (Leiden University, The Netherlands)

Abstract :

A central problem in quantum condensed matter physics is the critical theory
governing the zero temperature quantum phase transition between strongly
renormalized Fermi-liquids as found in heavy fermion intermetallics and pos-
sibly high Tc superconductors. We present here results showing that the math-
ematics of string theory is capable of describing such fermionic quantum criti-
cal states. Using the Anti-de-Sitter/Conformal Field Theory (AdS/CFT) corre-
spondence to relate fermionic quantum critical ﬁelds to a gravitational prob-
lem, we compute the spectral functions of fermions in the ﬁeld theory. By in-
creasing the fermion density away from the relativistic quantum critical point,
a state emerges with all the features of the Fermi-liquid.