Cluster Entanglement Mean Field inspired approach to Criticality in Classical Systems

Details Cluster Entanglement Mean Field inspired approach to Criticality in Classical Systems Cluster Entanglement Mean Field inspired approach to Criticality in Classical Systems

2010-08-05

arxiv.org/abs/1008.0965v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 (and a bit more) pages, 1 eps figure, RevTeX4

Scientific paper

We propose an entanglement mean field theory inspired approach for dealing with interacting classical many-body systems. It involves a coarse-graining technique that terminates a step before the mean field theory: While mean field theory deals with only single-body physical parameters, the entanglement mean field theory deals with single- as well as two-body ones. We improve the theory to a cluster entanglement mean field, that deals with a fundamental unit of the lattice of the many-body system. We apply these methods to interacting Ising spin systems in several lattice geometries and dimensions, and show that the predictions of the onset of criticality of these models are much better in the proposed theories as compared to the corresponding ones in mean field theories.

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