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



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Baity Jesi, Marco and Martín Mayor, Víctor and Parisi, G. and Pérez Gaviro, S. (2015) Soft Modes, Localization, and Two-Level Systems in Spin Glasses. Physical Review Letters, 115 (26). ISSN 0031-9007

[thumbnail of MartínMayorV LIBRE 40.pdf]

Official URL: http://dx.doi.org/10.1103/PhysRevLett.115.267205


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.

Item Type:Article
Additional Information:

© 2015 American Physical Society (APS).
We were supported by the European Research Council under the European Unions Seventh Framework Programme (FP7/2007-2013, ERC Grant Agreement No. 247328). We were partially supported by MINECO, Spain, through the research contract No. FIS2012-35719-C02. This work was partially supported by the GDRE 224 CNRS-INdAM GREFI-MEFI. M. B.-J. was supported by the FPU program (Ministerio de Educación, Spain). The authors thankfully acknowledge the resources from the supercomputer “Memento,” and the technical expertise and assistance provided by BIFI-ZCAM (Universidad de Zaragoza).

Uncontrolled Keywords:Physics, Multidisciplinary
Subjects:Sciences > Physics
ID Code:35676
Deposited On:12 Feb 2016 15:30
Last Modified:18 Oct 2019 14:57

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