关键词: diffusion energy limited aggregation, hetero-substrate, Monte Carlo simulation, cluster

Abstract: We have studied the aggregation of particles on a hetero-substrate consisting of two different substrates A and B with finite surface barriers $E_{\rm AB}$ and $E_{\rm BA}$ between the AB and BA boundaries, respectively. With  the diffusion energy limited aggregation (DELA) model, we find that the number of clusters and the mean radius of gyration of the clusters are dependent on the surface barriers $E_{\rm AB}$ and $E_{\rm BA}$. For the case with  a constant of $E_{\rm BA}$, a series of minima are summarized as $E_{\rm AB }= (E_{0 }- k_{\rm BA }E_{\rm BA })/ k_{\rm AB}$ with $k_{\rm AB}$ and $k_{\rm BA}$ being two integers, for main minima ($k_{\rm BA}=k_{\rm AB}- 1$)  and two local minima ($k_{\rm BA}=k_{\rm AB}$ and $k_{\rm BA}=k_{\rm AB} + 1$) between two neighbouring main minima.

Key words: diffusion energy limited aggregation, hetero-substrate, Monte Carlo simulation, cluster