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TT: Fachverband Tiefe Temperaturen

TT 43: Topological Insulators (organized by O)

TT 43.7: 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. VERGIORY^1,4, 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.