点缺陷对表面生长动力学标度行为的影响

摘要

基于含噪声Kuramoto-Sivashinsky方程，采用动力学重正化群技术，研究生长表面存在点缺陷或杂质对表面生长动力学标度行为的影响，得到了相应的粗糙度指数OL和动力学标度指数z．所得结果表明，点缺陷的存在使生长表面粗化，并缩短达到稳定生长的弛豫时间．%The dynamic scaling properties of growing surfaces with point-defects are studied by applying the dynamic renormalization-group approach to the noisy Kuramoto-Sivashinsky equation with an additional term of point-defects potential. From the roughness and the dynamic exponents a and z obtained here it follows that point-defects tend to roughen the growing surface and shorten its dynamic relaxation process to a steady-growth state.