C. Girardeaux, et al.
J. Phys. IV France 132 (2006) 57-61
Electrical conduction through a monatomic surface stepI. 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 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.
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