Ground state properties of two spin models with exactly known ground states on the square lattice

Details Ground state properties of two spin models with exactly known ground states on the square lattice Ground state properties of two spin models with exactly known ground states on the square lattice

2006-05-18

arxiv.org/abs/cond-mat/0605464v1

Physics

Condensed Matter

Statistical Mechanics

to appear in IJMPC 17, 12 pages, 7 figures

Scientific paper

10.1142/S0129183106009709

We introduce a new two-dimensional model with diagonal four spin exchange and
an exactly knownground-state. Using variational ansaetze 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 6x6.

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