Publication

Finite-size criteria for spectral gaps in 𝐷-dimensional quantum spin systems

Marius Christopher Lemm
2020
Book chapter

Abstract

We generalize the existing finite-size criteria for spectral gaps offrustration-free spin systems to D>2 dimensions. We obtain a local gapthreshold of 3/n, independent of D, for nearest-neighbor interactions. The 1/n scaling persists for arbitrary finite-range interactions in Z3. The key observation is that there is more flexibility in Knabe’s combinatorial approach if one employs the operator Cauchy-Schwarz inequality.

Official source

https://infoscience.epfl.ch/record/280380?ln=en

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Finite-size criteria for spectral gaps in 𝐷-dimensional quantum spin systems

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