外噪声场对二元混合物相分离的驱动作用

The driven-effect of external fluctuation on phase separation of binary mixtures

采用蒙特卡罗法研究了外高斯噪声场对二元混合物体系相分离的驱动作用 .研究发现 ,高斯噪声场的引入可以加快体系畴的生长 ,驱动体系形成沿着 [1,1]取向的条状畴结构 .在噪声强度一定、噪声作用的概率小于 0 0 15时 ,高斯噪声场消除了深度淬火引起的体系畴的冻结 ,畴的生长因子随噪声作用概率线性增加 .对足够强的高斯噪声场 ,存在一个最佳的作用概率区域 。

Using the Monte Carlo method, we have investigated the effect of the external noise on the phase-separation dynamics in binary mixtures. It is found that the addition of the fluctuation has speeded up the pattern growth, and driven the system to form [1,1]oriented tilted strip formation. When the noise intensity is fixed and the noise acting probability is less than p=0.015, the noise will erase the effect of the deep quench, and the system will avoid being frozen.With the increase of the noise acting probability, the structure factor will grow linearly. If the noise intensity is adequate, in an appropriate noise acting probability region, the system can form a high-oriented tilted strip pattern.