Soft Modes, Localization and Two-Level Systems in Spin Glasses
Disordered Systems and Neural Networks
2015-12-29 v2 Soft Condensed Matter
Abstract
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 not too large field the density of states develops localized soft {\em plastic} modes and reaches zero as (for large fiels 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.
Keywords
Cite
@article{arxiv.1506.04927,
title = {Soft Modes, Localization and Two-Level Systems in Spin Glasses},
author = {Marco Baity-Jesi and Victor Martin-Mayor and Giorgio Parisi and Sergio Perez-Gaviro},
journal= {arXiv preprint arXiv:1506.04927},
year = {2015}
}
Comments
13 pages, 14 figures. Version accepted for publication in Phys. Rev. Lett