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arXiv · 1509.06360

Correlation Length versus Gap in Frustration-Free Systems

David Gosset·Yichen Huang
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Abstract

Hastings established exponential decay of correlations for ground states of gapped quantum many-body systems. A ground state of a (geometrically) local Hamiltonian with spectral gap $ε$ has correlation length $ξ$ upper bounded as $ξ=O(1/ε)$. In general this bound cannot be improved. Here we study the scaling of the correlation length as a function of the spectral gap in frustration-free local Hamiltonians, and we prove a tight bound $ξ=O(1/\sqrtε)$ in this setting. This highlights a fundamental difference between frustration-free and frustrated systems near criticality. The result is obtained using an improved version of the combinatorial proof of correlation decay due to Aharonov, Arad, Vazirani, and Landau.

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David Gosset, Yichen Huang. 2016-03-07. Correlation Length versus Gap in Frustration-Free Systems. https://doi.org/10.1103/physrevlett.116.097202

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