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TT: Fachverband Tiefe Temperaturen

TT 40: Poster Session Correlated Electrons

TT 40.78: Poster

Wednesday, March 13, 2013, 15:00–19:00, Poster D

Functional RG study of Goldstone fluctuations in the ground state of a fermionic superfluid — •Benjamin Obert, Christoph Husemann, and Walter Metzner — Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569 Stuttgart, Germany

We analyse the effect of Goldstone fluctuations in the superfluid ground state of the attractive Hubbard model. We apply a coupled bosonic-fermionic functional renormalization group approach to investigate the infrared behaviour in the symmetry-broken state. Bosonic fluctuations, especially Goldstone fluctuations lead to several divergencies in the infrared, which partially cancel due to symmetry. Our results capture the exact infrared behaviour of the interacting Bose gas.