A Power-Law Upper Bound on the Correlations in the 2D Random Field Ising Model

Michael Aizenman, Ron Peled

Research output: Contribution to journalArticlepeer-review

Abstract

As first asserted by Y. Imry and S-K Ma, the famed discontinuity of the magnetization as function of the magnetic field in the two dimensional Ising model is eliminated, for all temperatures, through the addition of quenched random magnetic field of uniform variance, even if that is small. This statement is quantified here by a power-law upper bound on the decay rate of the effect of boundary conditions on the magnetization in finite systems, as function of the distance to the boundary. Unlike exponential decay which is only proven for strong disorder or high temperature, the power-law upper bound is established here for all field strengths and at all temperatures, including zero, for the case of independent Gaussian random field. Our analysis proceeds through a streamlined and quantified version of the Aizenman–Wehr proof of the Imry–Ma rounding effect.

Original languageEnglish (US)
Pages (from-to)865-892
Number of pages28
JournalCommunications In Mathematical Physics
Volume372
Issue number3
DOIs
StatePublished - Dec 1 2019

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Mathematical Physics

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