Rolling: A fast diffusion mechanism for small clusters on a solid surface

• 摘要：

  We have performed molecular-dynamics simulations to analyze diffusion of small clusters on a solid surface, and found a new diffusion mechanism in which a spherical-like cluster can move rapidly with a rolling motion. When applied to Ni n (n = 1-14) clusters on the Au(110)-(1×2) surface, our model predicted a cluster-size dependence in diffusion, with the most spherical-like Ni 4 and Ni 13 having the largest diffusion constants. Our model also confirmed that diffusion of Ni across the [11 ^- 0] troughs is slower than diffusion along the troughs. For the transverse diffusion, rolling of Ni 4 is, once again, an effective mode of cluster motion. © 1999 The American Physical Society.

• 作者：

  Fan W.;Gong X. G.;Lau W. M.

• 刊名：

  Physical Review B Condensed Matter and Materials Physics

• 在线出版时间：

  1999