Giant Rashba Splitting in Pb1–xSnxTe (111) Topological Crystalline Insulator Films Controlled by Bi Doping in the Bulk
2017
The topological properties of lead-tin chalcogenide topological
crystalline insulators can be widely tuned by temperature and
composition. It is shown that bulk Bi doping of epitaxial
Pb1-xSnxTe (111) films induces a giant Rashba splitting at the
surface that can be tuned by the doping level. Tight binding
calculations identify their origin as Fermi level pinning by
trap states at the surface.
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