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 15.78: Poster
Mittwoch, 24. März 1999, 14:30–18:00, Foy
Dynamics of an SO(5)-symmetric ladder model — •Ansgar Dorneich1, Robert Eder1, Marc G. Zacher1, Werner Hanke1, and Shou-Cheng Zhang2 — 1Institut für Theoretische Physik, Universität Würzburg, Am Hubland, 97074 Würzburg — 2Department of Physics, Stanford University, Stanford, USA
We discuss properties of a recently proposed exactly SO(5)-symmetric ladder model. In the strong coupling limit we demonstrate how the SO(3)-symmetric description of spin ladders in terms of bond Bosons can be upgraded to an SO(5)-symmetric bond-Boson model, which provides a particularly simple example for the concept of SO(5) symmetry. Based on this representation we show that antiferromagnetism on one hand and superconductivity on the other hand can be understood as condensation of either magnetic or charged Bosons into an RVB vacuum. We identify exact eigenstates of a finite cluster with general multiplets of the SO(5) group, and present numerical results for the single particle, spin and charge spectra of the SO(5)-symmetric model and identify ‘fingerprints’ of SO(5) symmetry in these. In particluar we show that SO(5) symmetry implies a ‘generalized rigid band behavior’ of the photoemission spectrum.