Lieb-Schultz-Mattis in Higher Dimensions

Details Lieb-Schultz-Mattis in Higher Dimensions Lieb-Schultz-Mattis in Higher Dimensions

2003-05-21

arxiv.org/abs/cond-mat/0305505v6

Phys.Rev. B69 (2004) 104431

Physics

Condensed Matter

Strongly Correlated Electrons

14 pages, 3 figures, final version in press

Scientific paper

10.1103/PhysRevB.69.104431

A generalization of the Lieb-Schultz-Mattis theorem to higher dimensional spin systems is shown. The physical motivation for the result is that such spin systems typically either have long-range order, in which case there are gapless modes, or have only short-range correlations, in which case there are topological excitations. The result uses a set of loop operators, analogous to those used in gauge theories, defined in terms of the spin operators of the theory. We also obtain various cluster bounds on expectation values for gapped systems. These bounds are used, under the assumption of a gap, to rule out the first case of long-range order, after which we show the existence of a topological excitation. Compared to the ground state, the topologically excited state has, up to a small error, the same expectation values for all operators acting within any local region, but it has a different momentum.

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