Jpn. J. Appl. Phys. 42 (2003) pp. 4642-4645  |Next Article|  |Table of Contents|
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Theoretical Analysis of Electron Standing Waves and Electric Field Intensity in the Vacuum Gap of Scanning Tunneling Microscopy

Koji Ando^1,, Noah Bray-Ali^1,, Yoshihiro Gohda^1,2 and Satoshi Watanabe^1,2,

(Received October 31, 2002; accepted for publication January 8, 2003)

Stimulated by a recent experiment [Jpn. J. Appl. Phys. 39 (2000) 3758] for evaluating electric field intensity near a surface using electron standing waves (ESWs) in the vacuum gap of scanning tunneling microscopy, we examined ESW and electric field intensity using first-principles calculations. Electric field intensity in the vacuum gap was evaluated for simple models, using both the methods used in the experimental analysis and differentiation of the calculated potential. The former method was found to give systematically a lower field intensity than the latter. However, neither method could reproduce the observed tendency of a lower field intensity at a higher ESW state.

KEYWORDS: density functional theory, scanning tunneling microscopy, electron standing wave, electric field intensity,
jellium model
URL: http://jjap.ipap.jp/link?JJAP/42/4642/
DOI: 10.1143/JJAP.42.4642

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