A Multi-Dimensional Lieb-Schultz-Mattis Theorem
Skip to main content
Open Access Publications from the University of California

Department of Mathematics

Faculty bannerUC Davis

A Multi-Dimensional Lieb-Schultz-Mattis Theorem

Published Web Location

No data is associated with this publication.

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.

Item not freely available? Link broken?
Report a problem accessing this item