科研之友
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摘要
By means of variable-temperature scanning tunneling microscopy, we have investigated systematically the formation process of Al magic cluster arrays on the Si(111)-7x7 surface at high temperature in situ. It was found that the magic clusters form only when the Al coverage is over a critical value, similar to 0.08 +/- 0.015 ML. These clusters occupy preferentially on the faulted-half-unit cells of the Si(111)-7x7 surface, but this preference is coverage dependent. By analyzing systematically the spatial distribution of magic clusters below the saturation coverage, an attractive interaction between clusters was found, which prevents a triangular ordering of the nanocluster array.
- 出版日期2007-8
