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arXiv · 1705.01957

Many-body localization transition through pairwise correlations

Jaime L. C. da C. Filho·Andreia Saguia·Lea F. Santos·Marcelo S. Sarandy
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Abstract

We investigate the phenomenon of spatial many-body localization (MBL) through pairwise correlation measures based on one and two-point correlation functions. The system considered is the Heisenberg spin-1/2 chain with exchange interaction $J$ and random onsite disorder of strength $h$. As a representative pairwise correlation measure obtained from one-point functions only, we use global entanglement. Through its finite size scaling analysis, we locate the MBL critical point at $h_{c}/J = 3.8$. As for measures involving two-point functions, we analyze pairwise geometric classical, quantum, and total correlations. Similarly to what happens for continuous quantum phase transitions, it is the derivatives of these two-point correlation measures that identify the MBL critical point, which is found to be in the range $h_{c}/J \in \left[3,4\right]$. Our approach relies on very simple measures that do not require access to multipartite entanglement or large portions of the system.

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Jaime L. C. da C. Filho, Andreia Saguia, Lea F. Santos, Marcelo S. Sarandy. 2017-05-04. Many-body localization transition through pairwise correlations. https://doi.org/10.1103/physrevb.96.014204

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