Journal
PHYSICAL REVIEW B
Volume 90, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.90.125312
Keywords
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Funding
- Austrian Science Fund (FWF) through Special Research Programme [F25 (SFB IR-ON)]
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The theoretical prediction that gray tin represents a strong topological insulator under strain [L. Fu and C.L. Kane, Phys. Rev. B 76, 045302 ( 2007)] is proven for biaxially strained alpha-Sn layers with varying thickness by means of a generalized density functional theory with a nonlocal exchange-correlation potential that widely simulates quasiparticle bands and a tight-binding method including intra- and interatomic spin-orbit interaction. Hydrogen-passivated surfaces are modeled by symmetric slabs. In contrast to the conventional picture of a topological insulator, we find topological gapless surface states below the strain-induced bulk gap, in agreement with photoemission studies. The topological surfaces states do not emerge out of the lower Gamma(+)(8) states but are strongly influenced by the inverted bulk Gamma(-)(7) band, i.e., lie within the negative bulk sp gap. We show that the position of the Dirac point and the dispersion of the surrounding bands depend on the thickness of the alpha-Sn layer but are less influenced by strain. The resulting Fermi velocities agree well with available photoemission data.
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