SITE-SELECTIVE IMAGING IN SCANNING-TUNNELING-MICROSCOPY OF GRAPHITE - THE NATURE OF SITE ASYMMETRY

被引:37
作者
GWO, S
SHIH, CK
机构
[1] Department of Physics, University of Texas, Austin
来源
PHYSICAL REVIEW B | 1993年 / 47卷 / 19期
关键词
D O I
10.1103/PhysRevB.47.13059
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In the absence of tip-sample mechanical interaction, graphite images show very different behaviors from those of typical images. Contrary to the current interpretation of site asymmetry, where protrusions in images are considered as B-site atoms, we have found that one can selectively image A- or B-site atoms depending on the bias polarity. Furthermore, the corrugation amplitude is extremely small. If measurements are performed under tip-sample mechanical interaction, one observes larger corrugations and in-phase images at opposite polarities. A new interpretation of site asymmetry is proposed.
引用
收藏
页码:13059 / 13062
页数:4
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