Abstract
We prove that ground states of quantum spin systems are characterized by a principle of minimum local energy and that translationally invariant ground states are characterized by the principle of minimum energy per unit volume.
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Bratteli, O., Kishimoto, A. & Robinson, D.W. Ground states of quantum spin systems. Commun.Math. Phys. 64, 41–48 (1978). https://doi.org/10.1007/BF01940760
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DOI: https://doi.org/10.1007/BF01940760