Double non-equivalent chain structure on vicinal Si(557)-Au surface

Abstract

We study electronic and topographic properties of the vicinal Si(557)-Au surface using scanning tunneling microscopy and reflection of high energy electron diffraction technique. STM data reveal double wire structures along terraces. Moreover behavior of the voltage dependent STM tip - surface distance is different in different chains. While the one chain shows oscillations of the distance which are sensitive to the sign of the voltage bias, the oscillations in the other chain remain unchanged with respect to the positive/negative biases. This suggests that one wire has metallic character while the other one - semiconducting. The experimental results are supplemented by theoretical calculations within tight binding model suggesting that the observed chains are made of different materials, one is gold and the other one is silicon chain.

9 pages, 12 figures, accepted for publication in Phys. Rev. B

References in corpus (5)

• Self-Doping of Gold Chains on Silicon: A New Structural Model for Si(111)5x2-Au
• Formation of ordered arrays of Ag nanowires and nanodots on Si(5 5 7) surface
• Two distinct metallic bands associated with monatomic Au wires on the Si(557)-Au surface
• Scanning tunneling microscopy of monoatomic gold chains on vicinal Si(335) surface: experimental and theoretical study
• Charge on the quantum dot in the presence of tunneling current

Cited by in corpus (10)

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• Systematic investigation of the structure of the Si(553)-Au surface from first principles
• Electron transport across a quantum wire in the presence of electron leakage to a substrate
• Nonclassical properties of electronic states of aperiodic chains in a homogeneous electric field
• First principles study of Si(335)-Au surface
• Temperature-dependent scanning tunneling spectroscopy on the Si(557)-Au surface
• Discontinuous conductance of bichromatically ac-gated quantum wires
• Electrical conductance at initial stage in epitaxial growth of Pb on modified Si(111) surface
• STM tunneling through a quantum wire with a side-attached impurity
• Tip apex charging effects in tunneling spectroscopy