Non-perturbative phenomena in the three-dimensional random field Ising model

Details Non-perturbative phenomena in the three-dimensional random field Ising model Non-perturbative phenomena in the three-dimensional random field Ising model

2006-03-27

arxiv.org/abs/cond-mat/0603713v1

J. Stat. Mech. (2006) P06003

Physics

Condensed Matter

Disordered Systems and Neural Networks

12 pages

Scientific paper

10.1088/1742-5468/2006/06/P06003

The systematic approach for the calculations of the non-perturbative contributions to the free energy in the ferromagnetic phase of the random field Ising model is developed. It is demonstrated that such contributions appear due to localized in space instanton-like excitations. It is shown that away from the critical region such instanton solutions are described by the set of the mean-field saddle-point equations for the replica vector order parameter, and these equations can be formally reduced to the only saddle-point equation of the pure system in dimensions (D-2). In the marginal case, D=3, the corresponding non-analytic contribution is computed explicitly. Nature of the phase transition in the three-dimensional random field Ising model is discussed.

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