Hamburg 2001 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 7: Supraleitung: Theorie
TT 7.2: Hauptvortrag
Dienstag, 27. März 2001, 10:00–10:30, J
Non-Fermi liquid physics and superconductivity in the 2D Hubbard model — •Thomas Pruschke and Thomas Maier — Institut f"ur Theoretische Physik, Universit"at Regensburg, 93040 Regensburg
The repulsive 2D Hubbard model is studied in the intermediate to strong coupling regime within the Dynamical Cluster Approximation (DCA). The DCA equations are solved with QMC techniques and an extended version of the resolvent perturbation technique (NCA). At and close to half filling strong renormalizations of the one-particle properties due to non-local antiferromagnetic spin fluctuations are observed which lead to a non-Fermi liquid behavior. At moderate doping an extended region of d-wave superconductivity occurs with a maximum in Tc between 10% and 20% doping. The d-wave gap of the superconducting state persists above Tc as pseudo-gap in the one-particle spectrum. The resulting phase diagram closely resembles that of the high-Tc cuprates.