Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 44: Low-Dimensional Systems: 2D - Theory (TT jointly with O)
O 44.7: Talk
Wednesday, April 2, 2014, 11:00–11:15, BEY 81
Renormalization group approach to non-analytic corrections in Fermi liquid theory — •Casper Drukier1,2, Philipp Lange1,2, and Peter Kopietz1,2 — 1Institut für Theoretische Physik, J.W.Goethe-Universität Frankfurt, Frankfurt am Main, Germany — 2Department of Physics, University of Florida, Gainesville, Florida, USA
We calculate the leading non-analytic magnetic field dependence of the free energy and spin-susceptibility of a two-dimensional Fermi liquid using functional renormalization group methods, with bosonized particle-hole fluctuations. At weak coupling we recover the perturbative results of Maslov and Chubukov [PRB 79, 075112 (2009)]. We go beyond perturbation theory by including self-energy and vertex corrections within a truncated vertex expansion and present explicit results for the leading non-analytic correction to the spin-susceptibility and other Fermi liquid parameters as a function of interaction strength.