- 99-404 Elliott H. Lieb, Peter Schupp
- Singlets and reflection symmetric spin systems
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Oct 24, 99
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Abstract. We rigorously establish some exact properties of reflection symmetric
spin systems with antiferromagnetic crossing bonds: At least one ground
state has total spin zero and a positive semidefinite coefficient
matrix. The crossing bonds obey an ice rule. This augments some
previous results which were limited to bipartite spin systems
and is of particular interest for frustrated spin systems.
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