Lieb-Schultz-Mattis theorem in higher dimensions from approximate magnetic translation symmetry

Abstract

We prove the Lieb-Schultz-Mattis (LSM) theorem on the energy spectrum of a general two or three-dimensional quantum many-body system with the U(1) particle number conservation and translation symmetry. Especially, it is demonstrated that the theorem holds in a system with long-range interactions. To this end, we introduce approximate magnetic translation symmetry under the total magnetic flux $\Phi =2\pi$ instead of the exact translation symmetry, and explicitly construct low energy variational states. The energy spectrum at $\Phi =2\pi$ is shown to agree with that at $\Phi =0$ in the thermodynamic limit, which concludes the LSM theorem.

arXiv comment5 pages

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