Anisotropy in Conductance of a Quasi-One-Dimensional Metallic Surface State Measured by a Square Micro-Four-Point Probe Method

Taizo Kanagawa, Rei Hobara, Iwao Matsuda, Takehiro Tanikawa, Akiko Natori, and Shuji Hasegawa
Phys. Rev. Lett. 91, 036805 – Published 18 July 2003

Abstract

We have devised a “square micro-four-point probe method” using an independently driven ultrahigh-vacuum four-tip scanning tunneling microscope, and succeeded for the first time to directly measure anisotropic electrical conductance of a single-atomic layer on a solid surface. A quasi-one-dimensional metal of a single-domain Si(111)4×1In had a surface-state conductance along the metallic atom chains (σ) to be 7.2(±0.6)×104   S/ at room temperature, which was larger than that in the perpendicular direction (σ) by 60 times. The σ was consistently interpreted by a Boltzmann equation with the anisotropic surface-state band dispersion, while the σ was dominated by a surface-space-charge-layer conductance.

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  • Received 4 April 2003

DOI:https://doi.org/10.1103/PhysRevLett.91.036805

©2003 American Physical Society

Authors & Affiliations

Taizo Kanagawa1, Rei Hobara1, Iwao Matsuda1,*, Takehiro Tanikawa1, Akiko Natori2, and Shuji Hasegawa1

  • 1Department of Physics, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
  • 2Department of Electronic Engineering, University of Electro-Communications, Chofu, Tokyo 182-8585, Japan

  • *Electronicaddress:matsuda@surface.phys.s.u-tokyo.ac.jp

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Vol. 91, Iss. 3 — 18 July 2003

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