 9273 Fannes M., Nachtergaele B., Werner , R.F.
 Abundance of translation invariant pure states
on quantum spin chains
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Jun 17, 92

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Abstract. We construct a set of translation invariant pure states of a
quantum spin chain, which is w*dense in the set of all translation
invariant states of the chain.
Each of the approximating states has exponential decay of
correlations, and is the unique ground state of a finite range
Hamiltonian with a spectral gap above the ground state energy.
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