GROUND STATE PROPERTIES OF TWO SPIN MODELS WITH EXACTLY KNOWN GROUND STATES ON THE SQUARE LATTICE

A. Sindermann, U. Löw and J. Zittartz
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A. Sindermann: Theoretische Physik, Universität zu Köln, Zülpicher Str.77, 50937 Köln, Germany
U. Löw: Theoretische Physik, Universität zu Köln, Zülpicher Str.77, 50937 Köln, Germany
J. Zittartz: Theoretische Physik, Universität zu Köln, Zülpicher Str.77, 50937 Köln, Germany

International Journal of Modern Physics C (IJMPC), 2006, vol. 17, issue 08, 1085-1094

Abstract: We introduce a new two-dimensional model with diagonal four spin exchange and an exactly known ground-state. Using variational ansätze and exact diagonalisation we calculate upper and lower bounds for the critical coupling of the model. Both for this model and for the Shastry–Sutherland model we study periodic systems up to system size6×6.

Keywords: Lanczos; quantum-spins; frustration (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1142/S0129183106009709

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