1. Soft Modes, Localization and Two-Level Systems in Spin Glasses
- Author
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Baity-Jesi, Marco, Martin-Mayor, Victor, Parisi, Giorgio, and Perez-Gaviro, Sergio
- Subjects
Condensed Matter - Disordered Systems and Neural Networks ,Condensed Matter - 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 $g(\omega)$ develops localized soft {\em plastic} modes and reaches zero as $\omega^4$ (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., Comment: 13 pages, 14 figures. Version accepted for publication in Phys. Rev. Lett
- Published
- 2015
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