Abstract
The electronic band structure of Si(557) surface adsorbed with Au wires is studied by means of first-principles density-functional-theory calculations. The spin–orbit split metallic bands are associated with the Au–Si zigzag chain and their asymmetric electron density around the Au atoms due to the on-site orbital hybridization explain large Rashba-type splitting and out-of-plane spin polarization. It is found that the Rashba metallic states have strong one-dimensional (1D) character along the Au wires but non-negligible two-dimensional distribution of the wave functions, implying not exactly genuine, only quasi 1D states.
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