Baek Seung Ki, Kim Beom Jun
School of Physics, Korea Institute for Advanced Study, Seoul 130-722, Korea.
Phys Rev E Stat Nonlin Soft Matter Phys. 2012 Jul;86(1 Pt 1):011132. doi: 10.1103/PhysRevE.86.011132. Epub 2012 Jul 30.
A magnetic system with a phase transition at temperature T(c) may exhibit double-resonance peaks under a periodic external magnetic field because the time scale matches the external frequency at two different temperatures, one above T(c) and the other below T(c). We study the double-resonance phenomena for the mean-field q-state clock model based on the heat-bath-type master equation. We find double peaks as observed in the kinetic Ising case (q = 2) for all q ≥ 4, but for the three-state clock model (q = 3), the existence of double peaks is possible only above a certain external frequency since it undergoes a discontinuous phase transition.
一个在温度(T(c))发生相变的磁系统，在周期性外磁场下可能会出现双共振峰，因为在两个不同温度下，时间尺度与外场频率相匹配，一个温度高于(T(c))，另一个低于(T(c))。我们基于热浴型主方程研究了平均场(q)态时钟模型的双共振现象。我们发现，对于所有(q\geq4)，都能观察到与动力学伊辛模型（(q = 2)）情况类似的双峰，但对于三态时钟模型（(q = 3)），由于它经历不连续相变，只有在外场频率高于某个特定值时才可能存在双峰。
