Anomalous distance dependence in scanning tunneling microscopy
作者:
A. Bryant,
D. P. E. Smith,
G. Binnig,
W. A. Harrison,
C. F. Quate,
期刊:
Applied Physics Letters
(AIP Available online 1986)
卷期:
Volume 49,
issue 15
页码: 936-938
ISSN:0003-6951
年代: 1986
DOI:10.1063/1.97489
出版商: AIP
数据来源: AIP
摘要:
In this work it is found experimentally that the appearance of surfaces in scanning tunneling microscope (STM) images can change drastically as the distance between the STM tip and sample is varied. Defects are found on gold‐sputtered graphite samples which appear as protrusions in charge density when the spacing exceeds a critical value. At smaller distances the protrusions are not evident in the images. It is possible to model these defects as gold atoms which lie just below the surface layer. We discuss possible mechanisms that give rise to the distance dependence.
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