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Spin texture and magnetism in pure and Mn-doped Bi2Te3

AuthorsHenk, J.; Ernst, A.; Eremeev, S. V.; Chulkov, Eugene V. ; Maznichenko, I. V.; Mertig, I.
Issue Date2012
CitationCECAM Workshop (2012)
AbstractTopological 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. The surface state in Mn-doped samples looses its topological character as a function of magnetization direction. The dispersion depends considerably on the direction of the Mn magnetization: For perpendicular magnetization, a gap of 16meV opens up at the Dirac point and strongly modifies the topological character; for in-plane magnetization, the Dirac point is conserved but shifted off the Brillouin zone center. The magnetic order is ferromagnetic with a critical temperature of 12 K. The results provide a path towards a magnetic control of the topological character of the surface state and its consequences to spin-dependent transport properties.
DescriptionTrabajo presentado al CECAM Workshop on "Topological Insulators and Non-Perturbative Spin-Orbit Coupling" celebrado en Lausanne (Suiza) del 9 al 11 de Enero de 2012.
Appears in Collections:(CFM) Comunicaciones congresos
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