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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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