Model potential of dimer system and coherence length of electron injected by scanning tunneling microscope on Ge(0 0 1) surface

Hiroshi Kawai, Yoshihide Yoshimoto, Osamu Narikiyo, Yosuke Hanawa, Akimasa Imamura

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

An improved model potential of the dimer system on the Ge(0 0 1) surface is obtained on the basis of the results of first-principles calculations. The electron-vibration coupling constant on the Ge(0 0 1) surface is obtained using the improved model potential. We propose a new theoretical formula for the coherence length of the tunneling electron injected by scanning tunneling microscope onto the semiconductor surface band. In the formula, the decoherence of the propagating electron is attributed to the strong electron-vibration coupling. The formula semi-quantitatively reproduces the decay length of the standing wave observed on the Ge(0 0 1) surface, and explains why the decay length of the standing wave on the Ge(0 0 1) surface is short even though the surface-localized bands on the Ge(0 0 1) surface are semiconductive.

Original languageEnglish
Pages (from-to)3010-3017
Number of pages8
JournalSurface Science
Volume602
Issue number18
DOIs
Publication statusPublished - Sep 15 2008

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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