无规扩散类反应表面生长动力学行为  

KINETICS AND SCALING BEHAVIOR OF RANDOM DIFFUSION REACTION SURFACE GROWTH

作　　者：朱晓斌[1] 王炜[1] 

机构地区：[1]南京大学物理系,固体物理研究所

出　　处：《南京大学学报（自然科学版）》1999年第1期82-88,共7页Journal of Nanjing University（Natural Science）

基　　金：南京大学固体微结构实验室资助;国家杰出青年基金;自然科学基金

摘　　要：研究了无规扩散类表面生长的动力学和标度行为，研究了两种粒子（Ａ、Ｃ）在二维衬底上的聚集．当Ｃ粒子的几率ｑ＝０时，系统表现出泊松生长．当ｑ≠０时，表面表现出粗化的形貌特性，存在着粗化转变．The growth of rough surface has been a subject of considerable interest because of its technological importance, and its relevance for the understanding nonequibrium statistical physics at a fundamental level. If there are some disorders of forbidden positions for the bonds in the system, the local structure of growth will be destroyed. In present work, we further study the above mentioned problems for a randomlike deposition model involved two kinds of particles in 2+1 dimensions. The physical motivation is mainly as following: The growth may model the reaction process like A+B=C. Two different kinds of particles, particle A (the active particle) with a probability 1 P, and particle C (the no active particle) with a probability P, are deposited on 2 dimensional substrate. Particles are allowed to fall straight down randomly, once at a time onto a growing surface and stick where they land. The deposition occurs when the particle on the top of the chosen site is particle A, or the particle on the top of the chosen site is particle C and one of the nearest neighbor (one unit higher than the top of the chosen site) is particle A. After this deposition, if the deposited particle is particle C, it is allowed to diffuse to its neighbors until it is located at a minimal height or located at the position where it has least three nearest neighbors. When the probability of particle C is zero, i.e. , the deposition is the traditional random deposition without diffusion of single particle. The surface width can not reach saturation. When the probability is not zero, i.e. , in 2+1 dimension, because of the diffusing effect of particle C, the morphological structural transitions are observed. When q changes, the saturation surface width shows non monotonous character. The influence of diffusion length L d of C particle and the influence of the diffusion probability to morphological transition are also studied.

关 键 词：表面生长 表面宽度 粗糙度 无规扩散类 动力学 

分 类 号：O484[理学—固体物理]