Marco Baity Jesi, Victor Martin-Mayor, Giorgio Parisi, Sergio Perez-Gaviro
Published 2015-06-16Version 1
We study the three-dimensional Heisenberg spin glass in a random field. For large fields a gap appears, while when they are small the density of states $g(\omega)$ develops localized soft modes and reaches zero as $\omega^4$. By imposing 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.
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