4.8 Article

Elemental Topological Insulator with Tunable Fermi Level: Strained α-Sn on InSb(001)

Journal

PHYSICAL REVIEW LETTERS
Volume 111, Issue 15, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.157205

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Funding

  1. Deutsche Forschungsgemeinschaft [FOR 1162, SCHA 1510/5-1]

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We report on the epitaxial fabrication and electronic properties of a topological phase in strained alpha-Sn on InSb. The topological surface state forms in the presence of an unusual band order not based on direct spin-orbit coupling, as shown in density functional and GW slab-layer calculations. Angle-resolved photoemission including spin detection probes experimentally how the topological spin-polarized state emerges from the second bulk valence band. Moreover, we demonstrate the precise control of the Fermi level by dopants.

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