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TT: Tiefe Temperaturen
TT 16: Mechanismus der HTSL
TT 16.2: Fachvortrag
Thursday, March 27, 2003, 10:00–10:25, HSZ304
From antiferromagnetism to d-wave superconductivity: The role of bosonic spin and charge excitations — •Werner Hanke — Institut für Theoretische Physik, Universität Würzburg, Am Hubland, 97074 Würzburg
We review recent numerical studies of a quantum “projected” SO(5) model which aims at a unifying description of antiferromagnetism and superconductivity in the high-Tc cuprates, while properly taking into account the Mott insulating gap. The derivation of this model from a (contractor) renormalization-group mapping of the strong-coupling (U=8t) Hubbard model onto an effective low-energy bosonic model is discussed. Our numerical results, obtained by the Quantum Monte Carlo technique of Stochastic Series Expansion, show that this model can give a realistic description of the global phase diagram of the high-Tc superconductors and accounts for many of their physical properties.