Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 66: Topological Insulators (Joint session of DS, HL, O, and TT, organized by MA)
HL 66.8: Vortrag
Mittwoch, 9. März 2016, 17:00–17:15, H32
Interplay between warping and magnetic effects in Fe monolayer on Sb2Te3 — •Farideh Hajiheidari1, Wei Zhang1,2, and Riccardo Mazzarello1,3 — 1Institute for Theoretical Solid State Physics, RWTH Aachen University, D-52074 Aachen, Germany — 2Center for Advancing Materials Performance from the Nanoscale, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, PR China — 3JARA-FIT and JARA-HPC, RWTH Aachen University, D-52074 Aachen, Germany
Three-dimensional topological insulators (TIs) realize an unconventional electronic phase originating from time-reversal symmetry and strong spin-orbit interaction (SOI). These materials are bulk insulators but possess conducting surface states in the bulk band gap. The surface states are topologically protected against non-magnetic disorder. However, impurities which break time-reversal symmetry induce a band gap in the system. This is of critical importance for potential device applications involving spin-based transport. In this work, we present a density-functional-theory study of the magnetic properties of a Fe monolayer on the (111) surface of the topological insulator Sb2Te3. We optimize the geometry of the system and determine the band structure and the easy axis of magnetization for the Fe atoms. We show that the easy axis is in-plane. In spite of this, the presence of the monolayer leads due to the opening of a gap of the order of meV, due to the interplay between magnetism and warping effects. Finally, we discuss the relevance of our findings to recent experiments about magnetic adatoms and monolayers deposited on TIs.