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Double band inversion in α-Sn: Appearance of topological surface states and the role of orbital composition

Victor A. Rogalev, Tomáš Rauch, Markus R. Scholz, Felix Reis, Lenart Dudy, Andrzej Fleszar, Marius-Adrian Husanu, Vladimir N. Strocov, Jürgen Henk, Ingrid Mertig, Jörg Schäfer, and Ralph Claessen
Phys. Rev. B 95, 161117(R) – Published 27 April 2017
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Abstract

The electronic structure of α-Sn (001) thin films strained compressively in-plane was studied both experimentally and theoretically. A new topological surface state (TSS) located entirely within the gapless projected bulk bands is revealed by ab initio-based tight-binding calculations as well as directly accessed by soft x-ray angle-resolved photoemission. The topological character of this state, which is a surface resonance, is confirmed by unravelling the band inversion and by calculating the topological invariants. In agreement with experiment, electronic structure calculations show the maximum density of states in the subsurface region, while the already established TSS near the Fermi level is strongly localized at the surface. Such varied behavior is explained by the differences in orbital composition between the specific TSS and its associated bulk states, i.e., their hybridization, respectively.

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  • Received 12 December 2016

DOI:https://doi.org/10.1103/PhysRevB.95.161117

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Victor A. Rogalev1, Tomáš Rauch2, Markus R. Scholz1, Felix Reis1, Lenart Dudy1, Andrzej Fleszar3, Marius-Adrian Husanu4,5, Vladimir N. Strocov4, Jürgen Henk2, Ingrid Mertig2,6, Jörg Schäfer1, and Ralph Claessen1

  • 1Physikalisches Institut und Röntgen Center for Complex Material Systems, Universität Würzburg, 97074 Würzburg, Germany
  • 2Institute of Physics, Martin Luther University Halle-Wittenberg, 06099 Halle (Saale), Germany
  • 3Institut für Theoretische Physik und Astronomie, Universität Würzburg, 97074 Würzburg, Germany
  • 4Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
  • 5National Institute of Materials Physics, 077125, Magurele, Romania
  • 6Max Planck Institute for Microstructure Physics, 06120 Halle (Saale), Germany

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Issue

Vol. 95, Iss. 16 — 15 April 2017

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