Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 25: Correlated Electrons - Poster Session
TT 25.33: Poster
Mittwoch, 29. März 2006, 14:30–18:30, P1
VCA-approach to the magnetic properties of the 2-D Hubbard Model — •Sascha Brehm1, Michael Potthoff1, Markus Aichhorn1,2, Enrico Arrigoni2, and Werner Hanke1 — 1Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany — 2Institut für Theoretische Physik, Technische Universität Graz, Petersgasse 16, A-8010 Graz, Austria
A new scheme for calculating two-particle (here spin-) response functions within the Variational Cluster Approach (VCA) [1] is presented and applied to the 2D-Hubbard model. The magnetic suszebility is calculated from the normal and superconducting one-particle Green’s functions extracted from the VCA for the infinite-sized system and the q- and omega-dependent 2-particle vertex obtained from a cluster calculation. It is shown that this approach reproduces some characteristic features of the neutron-scattering data for the magnetic excitations in high-Tc cuprates. [1]PRL 91,206402 (2003)