How Pb-overlayer islands move fast enough to self-assemble on Pb-Cu surface alloys

被引：20

作者：

Anderson, M. L.

Bartelt, N. C.

Feibelman, P. J.

Swartzentruber, B. S.

Kellogg, G. L.

机构：

[1] Sandia Natl Labs, Albuquerque, NM 87185 USA

[2] Sandia Natl Labs, Livermore, CA 94550 USA

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 09期

关键词：

D O I：

10.1103/PhysRevLett.98.096106

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Low-energy electron microscopy reveals that two-dimensional, similar to 50 000 atom, Pb-overlayer and vacancy islands both have diffusion coefficients of 25.6 +/- 0.8 nm(2)/sec at 400 degrees C on Pb-Cu surface alloys. This high mobility, key to self-assembly in this system, results from the fast transport of Pb atoms on the surface alloy and of Cu through the Pb overlayer. A high Pb vacancy concentration, predicted by ab initio calculations, facilitates the latter.

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页数：4

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