Nonmetallic transport of a quasi-one-dimensional metallic Si(557)-Au surface

Hiroyuki Okino, Rei Hobara, Iwao Matsuda, Taizo Kanagawa, Shuji Hasegawa, Jun Okabayashi, Satoshi Toyoda, Masaharu Oshima, Kanta Ono

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34 Citations (Scopus)


The sheet conductivity of a Au-covered Si(557) facet surface was measured by microscopic four-point probe methods using an independently driven four-tip scanning tunneling microscope and temperature-variable monolithic probes. This surface is composed of a periodic array of Au chains and known to have a quasi-one-dimensional metallic band structure. Its surface conductivities parallel to the Au chains (σ) and perpendicular to them (σ), were obtained separately at room temperature (RT), and the anisotropy σ was ∼3. The temperature dependence of the surface conductivity showed a semiconductive character below RT with an activation energy of ∼55 meV. Then it can be concluded that the transport along the Au chains is not metallic band conduction.

Original languageEnglish
Article number113404
Pages (from-to)113404-1-113404-4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number11
Publication statusPublished - 2004 Sep
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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