Exact spin-spin correlation function for the zero-temperature random-field Ising model

Details Exact spin-spin correlation function for the zero-temperature random-field Ising model Exact spin-spin correlation function for the zero-temperature random-field Ising model

2011-06-17

arxiv.org/abs/1106.3424v2

J. Stat. Mech. (2012) P01001

Physics

Condensed Matter

Statistical Mechanics

21 pages, 8 figures

Scientific paper

10.1088/1742-5468/2012/01/P01001

An exact expression for the spin-spin correlation function is derived for the zero-temperature random-field Ising model defined on a Bethe lattice of arbitrary coordination number. The correlation length describing dynamic spin-spin correlations and separated from the intrinsic topological length scale of the Bethe lattice is shown to diverge as a power law at the critical point. The critical exponents governing the behaviour of the correlation length are consistent with the mean-field values found for a hypercubic lattice with dimension greater than the upper critical dimension.

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