Journal
PHYSICAL REVIEW B
Volume 91, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.201411
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Funding
- Swedish Research Council
- Goran Gustafsson Foundation
- Knut and Alice Wallenberg Foundation
- European Research Council under the European Union's Seventh Framework Program/ERC [DM-321031]
- US DOE Basic Sciences for the National Nuclear Security Administration of the US Department of Energy [DE-AC52-06NA25396]
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We show that the energy gap induced by ferromagnetically aligned magnetic impurities on the surface of a topological insulator can be filled, due to scattering off the nonmagnetic potential of the impurities. In both a continuum surface model and a three-dimensional tight-binding lattice model, we find that the energy gap disappears already at weak potential scattering as impurity resonances add spectral weight at the Dirac point. This can help explain seemingly contradictory experimental results as to the existence of a gap.
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