Soft Modes, Localization, and Two-Level Systems in Spin Glasses

In the three-dimensional Heisenberg spin glass in a random field, we study the properties of the inherent structures that are obtained by an instantaneous cooling from infinite temperature. For a not too large field the density of states g(ω) develops localized soft plastic modes and reaches zero as...

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Bibliographic Details
Published inPhysical review letters Vol. 115; no. 26; p. 267205
Main Authors Baity-Jesi, M, Martín-Mayor, V, Parisi, G, Perez-Gaviro, S
Format Journal Article
LanguageEnglish
Published United States 31.12.2015
Subjects
Glass - chemistry
Models, Chemical
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Summary:In the three-dimensional Heisenberg spin glass in a random field, we study the properties of the inherent structures that are obtained by an instantaneous cooling from infinite temperature. For a not too large field the density of states g(ω) develops localized soft plastic modes and reaches zero as ω(4) (for large fields a gap appears). When we perturb the system adding a force along the softest mode, one reaches very similar minima of the energy, separated by small barriers, that appear to be good candidates for classical two-level systems.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.115.267205