Interface induced states at the boundary between a 3D topological insulator Bi${}_2$Se${}_3$ and a ferromagnetic insulator EuS

Abstract

By means of relativistic density functional theory (DFT) calculations we study electron band structure of the topological insulator (TI) Bi${}_2$Se${}_3$ thin films deposited on the ferromagnetic insulator (FMI) EuS substrate. In the Bi${}_2$Se${}_3$/EuS heterostructure, the gap opened in the spectrum of the topological state has a hybridization character and is shown to be controlled by the Bi${}_2$Se${}_3$ film thickness, while magnetic contribution to the gap is negligibly small. We also analyzed the effect of Eu doping on the magnetization of the Bi${}_2$Se${}_3$ film and demonstrated that the Eu impurity induces magnetic moments on neighboring Se and Bi atoms an order of magnitude larger than the substrate-induced moments. Recent magnetic and magneto-transport measurements in EuS/Bi${}_2$Se${}_3$ heterostructure are discussed.

submitted to Special issue (MISM-2014, 29 June - 3 July 2014, Moscow) in Journal of Magnetism and Magnetic Materials

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