J. Phys. IV France
Volume 132, March 2006
Page(s) 57 - 61
Published online 11 March 2006
10th International Conference on the Formation of Semiconductor Interfaces
C. Girardeaux, et al.
J. Phys. IV France 132 (2006) 57-61

DOI: 10.1051/jp4:2006132011

Electrical conduction through a monatomic surface step

I. Matsuda1, 0, T. Hirahara1, M. Ueno1, R. Hobara1 and S. Hasegawa1

1  Department of Physics, School of Science, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

We have succeeded in measuring resistance across a single atomic step at electrical conduction through a monatomic-layer metal on a crystal surface. Using independent methods of direct electrical conductivity measurement with four-tip scanning tunneling microscope probes and scanning tunneling spectroscopy observation, the conductivity across a monatomic step was found to be about $5 \times
10^{3}\,\Omega ^{-1}$m-1. Through analyses of the Landauer formula for 2D conductors and the recent theoretical calculations, the electron transport across an atomic step is fairly modeled as a tunneling process. Important formulas of surface conductivity developed by the present research are given.

© EDP Sciences 2006