Volume 9 (2026)
Collin, Orphée;  Giacomin, Giambattista;  Hu, Yueyun
The random field Ising chain domain-wall structure in the large interaction limit
Annales Henri Lebesgue, Volume 9 (2026), pp. 321-369

Metadata

DOI10.5802/ahl.268
Keywords disordered systems ,  transfer matrix method ,  random matrix products ,  infinite disorder RG fixed point ,  random walk excursion theory

Abstract

We study the configurations of the nearest neighbor Ising ferromagnetic chain with IID centered and square integrable external random field in the limit in which the pairwise interaction tends to infinity. The available free energy estimates for this model show a strong form of disorder relevance (i.e., a strong effect of disorder on the free energy behavior) and our aim is to make explicit how the disorder affects the spin configurations. We give a quantitative estimate that shows that the infinite volume spin configurations are close to one explicit disorder dependent configuration when the interaction is large. Our results confirm predictions on this model obtained by D. S. Fisher and coauthors by applying the renormalization group method.


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