中文摘要：

研究了二维的动力学伊辛模型在一个具有偏向的振荡外场中的成核过程，主要关注成核时间与外场振荡周期ω的关系．随着ω的变化，成核时间出现最小值，最小的成核时间对应的平均临界核的大小也是最小的，这表明存在一个最佳的振荡频率，相比较于一个确定的外场，它更有利于成核,同时还研究了外场的初始相位的影响．

英文摘要：

We have studied the nucleation process of a two-dimensional kinetic Ising model subject to a bias oscillating external field, focusing on how the nucleation time depends on the oscillation frequency. It is found that the nucleation time shows a clear-cut minimum with the variation of oscillation frequency, wherein the average size of the critical nuclei is the smallest, indicating that an oscillating external field with an optimal frequency can be much more favorable to the nucleation process than a constant field. We have also investigated the effect of the initial phase of the external field, which helps to illustrate the occurrence of such an interesting finding.