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articleNo Access
GROUND STATE PROPERTIES OF TWO SPIN MODELS WITH EXACTLY KNOWN GROUND STATES ON THE SQUARE LATTICE
- A. SINDERMANN,
- U. LÖW, and
- J. ZITTARTZ
International Journal of Modern Physics C01 Aug 2006
Preview 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 size 6×6.

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