Regensburg 2010 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 27: CE: Poster Session
TT 27.84: Poster
Wednesday, March 24, 2010, 14:00–18:00, Poster D1
Consistent description of magnetic excitations and phase diagram of high-Tc cuprates within a strong-coupling approach — Sascha Brehm1, •Enrico Arrigoni2, Markus Aichhorn3, and Werner Hanke1 — 1Institute for Theoretical Physics and Astrophysics, University of Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Institute of Theoretical Physics and Computational Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria — 3Centre de Physique Theorique, Ecole Polytechnique, 91128 Palaiseau Cedex, France
Magnetic excitations of the high-Tc cuprate superconductors (HTSC) are shown to be correctly reproduced within a two-dimensional Hubbard model in the appropriate strong-coupling regime. In particular, salient properties of the magnetic resonance mode, its intensity behavior in the underdoped regime and the “hour glass” dispersion display a good agreement with experiments. Our results are obtained in an essentially parameter-free theory based on an extension of the variational cluster approach (VCA) to treat two-particle excitations. When combined with earlier phase-diagram calculations using the VCA, it lends further support to a Hubbard-model description of the interplay of magnetism and superconductivity in the cuprate HTSC.