Abstract
Topological insulators are characterized by the presence of spin-momentum-locked surface states with Dirac points that span the fundamental bulk band gap. We show by first-principles calculations that the surface state of the insulator survives upon moderate Mn doping of the surface layers. The spin texture of both undoped and Mn-doped is much more complicated than commonly believed, showing layer-dependent spin reversal and spin vortices.
- Received 24 October 2011
DOI:https://doi.org/10.1103/PhysRevLett.108.206801
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