Awadhesh Narayan, Ivan Rungger, Stefano Sanvito
In this work we study topologically protected states on the Sb(111) surface by using {\it ab-initio} transport theory. In presence of a strong surface perturbation we obtain standing wave states resulting from the superposition of spin polarized surface states. By Fourier analysis, we identify the underlying scattering processes and the spin texture. We find evidence of resonant transmission across surface barriers at quantum well states energies and evaluate their life-times. Our results are in excellent agreement with experimental findings. We also show that despite the presence of a step edge along a different high symmetry direction, not yet probed experimentally, the surface states exhibit unperturbed transmission around the Fermi energy for states with near normal incidence.
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http://arxiv.org/abs/1207.4716
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