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Phys Rev Lett. 2012 May 18;108(20):206801. Epub 2012 May 14.

Complex spin texture in the pure and Mn-doped topological insulator Bi2Te3.

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  • 1Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120, Halle, Germany. juergen.henk@physik.uni-halle.de

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 Bi2Te3 survives upon moderate Mn doping of the surface layers. The spin texture of both undoped and Mn-doped Bi2Te3 is much more complicated than commonly believed, showing layer-dependent spin reversal and spin vortices.

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