https://doi.org/10.1140/epjb/e2015-60197-y
Regular Article
Anomalous response in the vicinity of spontaneous symmetry breaking
1
Department of PhysicsPukyong National University,
608-737
Busan, Korea
2
Department of Physics, Sungkyunkwan University,
440-746
Suwon,
Korea
a e-mail: seungki@pknu.ac.kr
b e-mail: beomjun@skku.edu
Received:
11
March
2015
Received in final form:
12
April
2015
Published online:
18
May
2015
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.
Key words: Statistical and Nonlinear Physics
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2015