Münster 1999 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 15: Postersitzung II: Elektronische Eigenschaften (1-12), Josephson-Kontakte (13-27), Heavy Fermions (28-40), Theorie HTSL (41-48), M-I-Überg
änge, Korrelierte Systeme (49-79)
TT 15.47: Poster
Mittwoch, 24. März 1999, 14:30–18:00, Foy
Rotation from antiferromagnetism to superconductivity in a “projected” SO(5) symmetry — •Enrico Arrigoni1, Werner Hanke1, and Shoucheng Zhang2 — 1Institut für Theoretische Physik Universität Würzburg, D-97074 Würzburg — 2Department of Physics, Stanford University; Stanford, CA 94305 USA
The physics of the Hubbard gap and of the SO(5) theory of high-Tc superconductivity [1,2] can be combined by introducing a “projected” SO(5) symmetry whereby the symmetry group is restricted to the hole-doped states. We show that a superconducting state exists as a SO(5) rotation from the antiferromagnetic phase also for this projected symmetry. A bosonic model with interacting magnons and hole pairs is introduced for which a projected SO(5) symmetry is exactly realized. We discuss the nature of the transition form antiferromagnetism to superconductivity as the system is doped, the implications for effective SO(5) nonlinear-σ-models theories and for renormalization-group calculations [3].
[1] S.-C. Zhang, Science 275, 1089 (1997)
[2] R. Eder, W. Hanke, and S. C. Zhang, Phys. Rev. B 57, 13781 (1998)
[3] E. Arrigoni and W. Hanke, cond-mat/9712143