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A class of two-dimensional AKLT models with a gap

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arxiv 1901.09297 v2 pith:MQNSJDPG submitted 2019-01-27 math-ph cond-mat.stat-mechcond-mat.str-elmath.MPquant-ph

classification math-phcond-mat.stat-mechcond-mat.str-elmath.MPquant-ph
keywords akltspintwo-dimensionalhexagonallatticemodelmodelsspectral
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abstract

The AKLT spin chain is the prototypical example of a frustration-free quantum spin system with a spectral gap above its ground state. Affleck, Kennedy, Lieb, and Tasaki also conjectured that the two-dimensional version of their model on the hexagonal lattice exhibits a spectral gap. In this paper, we introduce a family of variants of the two-dimensional AKLT model depending on a positive integer $n$, which is defined by decorating the edges of the hexagonal lattice with one-dimensional AKLT spin chains of length $n$. We prove that these decorated models are gapped for all $n \geq 3$.

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  1. Improved local spectral gap thresholds for lattices of finite dimension

    quant-ph 2019-09 conditional novelty 7.0 of 10

    For frustration-free Hamiltonians on any finite-dimensional lattice, the minimum spectral gap of any rectangular region is O(γ + 1/t²) where t is the shortest side length, improving previous thresholds.

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