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arXiv · 1505.00070

Anomalous response in the vicinity of spontaneous symmetry breaking

Seung Ki Baek·Hye Jin Park·Beom Jun Kim
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Abstract

We propose a mechanism to induce negative AC permittivity in the vicinity of a ferroelectric phase transition involved with spontaneous symmetry breaking. This mechanism makes use of responses at low frequency, yielding a high gain and a large phase delay, when the system jumps over the free-energy barrier with the aid of external fields. We illustrate the mechanism by analytically studying spin models with the Glauber-typed dynamics under periodic perturbations. Then, we show that the scenario is supported by numerical simulations of mean-field as well as two-dimensional spin systems.

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Seung Ki Baek, Hye Jin Park, Beom Jun Kim. 2015-05-01. Anomalous response in the vicinity of spontaneous symmetry breaking. https://doi.org/10.1140/epjb%2Fe2015-60197-y

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