Regensburg 2000 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
TT: Tiefe Temperaturen
TT 17: Postersitzung II: Pinning und Vortexdynamik (1-8), Supraleitung: Theorie (9-13), Korrelierte Elektronen (14-48), Niederdimensionale Systeme (49-68), Quantenflüssigkeiten (69-75)
TT 17.11: Poster
Mittwoch, 29. März 2000, 14:30–18:00, A
Numerical Study of Projected SO(5) Models — •Enrico Arrigoni1, Ansgar Dorneich1, Werner Hanke1, and Shou-Cheng Zhang2 — 1Institut für Theoretische Physik,Am Hubland,97074 Würzburg — 2Stanford University, Ca
The central hypothesis of the recently developed projected SO(5) theory[1] states that the high-Tc superconductors can be described by a fully SO(5)-symmetric Hamiltonian supplemented by the Gutzwiller constraint. This takes, in particular, the asymmetry between spin and charge excitations and the Mott-Hubbard gap into account. In this work we explore the consequences of the projection in a hard-core boson model with interacting magnons and hole pairs for which projected SO(5) symmetry is exactly realized. We study this model numerically by means of Quantum-Monte-Carlo simulations using the Stochastic Series Expansion technique with loop operator update. The projected SO(5) model is shown to describe salient features of the AF-SC transition.
[1] S.C. Zhang, J.P. Hu, E. Arrigoni, W. Hanke and A. Auerbach, cond-mat/9904142 (to be pubished in PRB)