Nothing moves a surface: Vacancy mediated surface diffusion

被引:121
作者
van Gastel, R
Somfai, E
van Albada, SB
van Saarloos, W
Frenken, JWM
机构
[1] Leiden Univ, Kamerlingh Onnes Lab, NL-2300 RA Leiden, Netherlands
[2] Leiden Univ, Inst Lorentz, NL-2300 RA Leiden, Netherlands
关键词
D O I
10.1103/PhysRevLett.86.1562
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We report scanning tunneling microscopy observations, which imply that all atoms in a Cu(001) surface move frequently, even at room temperature. Using a low density of embedded indium "tracer" atoms, we visualize the diffusive motion of surface atoms. Surprisingly, the indium atoms seem to make concerted, long jumps. Responsible fur this, motion is an ultralow density of surface vacancies, diffusing rapidly within the surface. This interpretation is supported by a detailed analysis of the displacement distribution of the indium atoms, which reveals a shape characteristic fur the vacancy mediated diffusion mechanism that we propose.
引用
收藏
页码:1562 / 1565
页数:4
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