Large modulation-amplitude, local barrier-height, scanning tunneling microscopy

M. Yoon, Mai H, R. F. Willis

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We compare and contrast both STM topographic images and local tunneling barrier-height (LBH) spatial distributions using relatively large modulation of the tunneling gap. Measurements were carried out on various surfaces including Si(111)-(7 × 7), Ge(111)-(3 × 1)-Na, Si(111)-(√3 × √3)-Sn. The experimental results of the local barrier-height obtained in this way are dependent on the tip-sample distance indicative of strong tip-sample interaction. The large modulation LBH method senses the "hardness" of the tip surface interaction potential, which varies with lattice position. Both methods, STM topographic images and local barrier-height images, provide complementary, but different information, to check the consistency of structural conclusions.

Original languageEnglish
Pages (from-to)626-632
Number of pages7
JournalEurophysics Letters
Volume54
Issue number5
DOIs
Publication statusPublished - 2001 Jun 1
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy

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