A Multi-Dimensional Lieb-Schultz-Mattis Theorem

Details A Multi-Dimensional Lieb-Schultz-Mattis Theorem A Multi-Dimensional Lieb-Schultz-Mattis Theorem

2006-08-18

arxiv.org/abs/math-ph/0608046v2

Commun. Math. Phys. 276 (2007) 437--472

Physics

Mathematical Physics

final version

Scientific paper

10.1007/s00220-007-0342-z

For a large class of finite-range quantum spin models with half-integer spins, we prove that uniqueness of the ground state implies the existence of a low-lying excited state. For systems of linear size L, of arbitrary finite dimension, we obtain an upper bound on the excitation energy (i.e., the gap above the ground state) of the form (C\log L)/L. This result can be regarded as a multi-dimensional Lieb-Schultz-Mattis theorem and provides a rigorous proof of a recent result by Hastings.

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