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

Baity-Jesi, M. ; Martín-Mayor, V. ; Parisi, G. ; Perez-Gaviro, S. (Universidad de Zaragoza)

Resumen: 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(¿) develops localized soft plastic modes and reaches zero as ¿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.

Idioma: Inglés

DOI: 10.1103/PhysRevLett.115.267205

Año: 2015

Publicado en: Physical Review Letters 115, 26 (2015), 267205 [6 pp]
ISSN: 0031-9007

Factor impacto JCR: 7.645 (2015)

Categ. JCR: PHYSICS, MULTIDISCIPLINARY rank: 6 / 79 = 0.076 (2015) - Q1 - T1

Factor impacto SCIMAGO: 4.656 - Physics and Astronomy (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/EC/FP7/247328/EU/Critical Phenomena in Random Systems/CRIPHERASY
Financiación: info:eu-repo/grantAgreement/ES/MINECO/FIS2012-35719-C02

Tipo y forma: Article (Published version)

Área (Departamento): Área Física Teórica (Dpto. Física Teórica)