Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 24: SC: Properties, Electronic Structure, Mechanisms

TT 24.15: Vortrag

Mittwoch, 24. März 2010, 18:15–18:30, H19

Ferromagnetism and d-wave superconductivity in the 2D Hubbard modelCarsten Honerkamp1, •Christoph Husemann2, Jutta Ortloff3, and Manfred Salmhofer21Institut für Theoretische Physik C, RWTH Aachen, Germany — 2Institut für Theoretische Physik, Universität Heidelberg, Germany — 3Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Germany

By using the functional renormalization group we compute detailed momentum dependencies of the scale-dependent interaction vertex of the 2D (t,t')-Hubbard model. Compared to previous studies we improve accuracy by separating dominant parts from a remainder term. The former explicitly describe, for example, the interaction of Cooper pairs or spin operators. Applying the method to the repulsive Hubbard model we find d-wave superconductivity or ferromagnetism for larger next-to-nearest neighbor hopping amplitude |t'| at Van Hove Filling. Both ordering tendencies strongly compete with each other.

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