Regensburg 1998 – scientific programme
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TT: Tiefe Temperaturen
TT 21: Postersitzung III: Spin-Peierls-Systeme, Metall-Isolator-Übergang, Lokalisierung; SL: Theorie; Quantenflüssigkeiten und -kristalle; Amorphe Materialien, Tunnelsysteme; Borcarbide, Fullerene, konventionelle SL; SL dünner Filme; Experimentiertechniken
TT 21.43: Poster
Thursday, March 26, 1998, 15:00–18:30, D
Numerical study of SO(5) symmetry in strong correlation models — •R. Eder1, A. Dorneich1, C. Gröber1, S. Meixner1, M. Zacher1, W. Hanke1, and S. C. Zhang2 — 1Institut für Theoretische Physik, Am Hubland, D-97074 Würzburg — 2Department of Physics, Stanford University, Stanford, CA 94305
In this work, we present numerical results which support SO(5) symmetry as
a concept unifying superconductivity and antiferromagnetism in the
high-temperature superconductors. Using exact cluster diagonalization, we
verify that the low-energy states of the planar t−J model
as well as t−J ladders, form SO(5) symmetry
multiplets. Our results show that the d−wave
superconducting ground states away from half-filling are obtained from the
higher spin states at half-filling through SO(5) rotations.
We discuss implications of SO(5) symmetry for photoelectron
spectroscopy, using a recently proposed exact SO(5) symmetric model,
and propose a direct mapping between the exact model and
‘physical’ t−J ladders.