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∥/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.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2004 Sep|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics