Dresden 2006 – scientific programme
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TT: Tiefe Temperaturen
TT 30: Superconductivity: Twenty Years High-Tc Cuprates - Recent Progress
TT 30.17: Talk
Thursday, March 30, 2006, 18:15–18:30, HSZ 02
Superconductivity and Antiferromagnetism in the 2d-Hubbard model – An RG and MF approach — •Julius Reiss, Daniel Rohe, and Walter Metzner — MPI-FKF,Heisenbergstrasse 1, 70569 Stuttgart
The functional renormalisation technique in the wick-ordered scheme is used to derive an low energy model, which is treated with an extended mean-field calculation to get insight into the symmetry-broken phase of the 2–dimensional Hubbard model. d-wave superconductivity (SC) and s-wave antiferromagnetism (AF) and coexistence of both is found. The issue of the reliability of low energy models for order parameters, which show first order transitions, like the AF, is discussed.