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

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

2006-01-14

arxiv.org/abs/cond-mat/0601312v1

Phys. Rev. B73, 075415 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

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

Scientific paper

10.1103/PhysRevB.73.075415

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.

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