Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 29: Topological Insulators
O 29.7: Vortrag
Dienstag, 1. April 2014, 12:00–12:15, GER 38
Magnetic interaction and magnetic fluctuations in topological insulators with ordered and disordered magnetic adatoms — •MAIA G. VERGIORY1,4, LEVAN CHOTORLISHVILI2, ARTHUR ERNST1, VITALI DUGAEV1, ANDREAS KOMNIK3, MIJAIL OTROKOV4, EVGUENI CHULKOV4, and JAMAL BERADKAR2 — 1Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany — 2Institut fr Physik, Martin-Luther-Universitat Halle-Wittenberg, Germany — 3Institut fr Theoretische Physik, Universitt Heidelberg, Germany, — 4Donostia International Physics Center, Donostia - San Sebastian, Spain
Using a first-principles Green's function approach we study magnetic properties of the magnetic binary topological insulators Bi2Se3, Bi2Te23 and Sb2Te3 doped with 3d transition metals. We analyze the magnetic phase for each dopant, the exchange interaction, the Curie temperature and the Bloch spectral function. Furthermore, we observe that the interaction of magnons with surface electrons essentially renormalizes the electron energy spectrum. The renormalized spectrum is nonlinear and can be characterized by a negative effective mass of electrons and holes for any k point different from 0. The electron velocity near the Dirac point depends on the electron-magnon coupling.