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Topological character and magnetism of the Dirac state in Mn-Doped Bi2Te3

AuthorsHenk, J.; Flieger, M.; Maznichenko, I. V.; Mertig, I.; Ernst, A.; Eremeev, S. V.; Chulkov, Eugene V.
Issue Date2012
PublisherAmerican Physical Society
CitationPhysical Review Letters 109: 076801 (2012)
AbstractFirst-principles and model calculations show that the Dirac surface state of the topological insulator Bi 2Te 3 survives upon moderate Mn doping of the surface layers but can lose 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 16 meV opens up at the Dirac point; for in-plane magnetization, a tiny gap can be opened or closed in dependence on the magnetization azimuth. The ground state is ferromagnetic, with a critical temperature of 12 K. The results provide a path towards a magnetic control of the topological character of the Dirac surface state and its consequences to spin-dependent transport properties. © 2012 American Physical Society.
DescriptionTrabajo presentado como póster al CECAM Workshop on "Topological Materials" celebrado en Bremen (Alemania) del 13 al 17 de Agosto de 2012.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.109.076801
Identifiersdoi: 10.1103/PhysRevLett.109.076801
issn: 0031-9007
e-issn: 1079-7114
Appears in Collections:(CFM) Artículos
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