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TT: Tiefe Temperaturen
TT 7: Correlated Electrons - (General) Theory II
TT 7.3: Talk
Friday, March 4, 2005, 17:15–17:30, TU H2053
Fermionic renormalization group flow into phases with broken symmetry — •Carsten Honerkamp1, Manfred Salmhofer2, Walter Metzner1, and Oliver Lauscher2 — 1MPI Festkörperforschung, Stuttgart — 2Theoretische Physik, Universität Leipzig
We present an extension of the fermionic functional RG which allows us to continue the RG flow into long-range ordered phases. For the example of Cooper pairing we discuss how the divergence of the RG flow without selfenergy corrections is cured and how BCS and Eliashberg gap equations are obtained from the RG. We describe how vertex corrections beyond the mean-field approach and the Kohn-Luttinger mechanism are included in this formalism.