Atomic-dipole-moment induced local surface potential on Si(111)-(7 × 7) surface studied by non-contact scanning nonlinear dielectric microscopy

Kohei Yamasue, Masayuki Abe, Yoshiaki Sugimoto, Yasuo Cho

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We have performed the site-specific, quantitative measurement of a local surface potential induced by atomic dipoles on a Si(111)-(7 × 7) surface by non-contact scanning nonlinear dielectric microscopy (NC-SNDM) combined with an atom-tracking technique. The measured potentials were quantitatively consistent with those estimated by a simultaneous measurement of the tunneling current, which validates a previously proposed hypothetical mechanism that explains the unexpected resemblance between the dipole and time-averaged tunneling current images in NC-SNDM imaging. The results show that an asymmetry arising in the current-voltage characteristics within the tunneling regime is governed by the local surface potential induced by atomic dipoles.

Original languageEnglish
Article number121601
JournalApplied Physics Letters
Volume105
Issue number12
DOIs
Publication statusPublished - 2014 Jan 1

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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