Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 32: Transport: Topological Insulators - 3D
(Joint session of DS, HL, MA, O and TT organized by TT)

TT 32.5: Vortrag

Dienstag, 8. März 2016, 15:15–15:30, H18

Detection of current-induced spin polarization in BiSbTeSe₂ toplogical insulator — •Fan Yang¹, Subhamoy Ghatak¹, Alexey Taskin¹, Yuichiro Ando², and Yoichi Ando¹ — ¹Institute of Physics II, University of Cologne, Germany — ²Department of Electronic Science and Engineering, Kyoto University, Japan

Topological insulators (TIs) are a class of quantum matter which possess spin-momentum-locked Dirac Fermions on the surfaces. Due to the spin-momentum locking, spin polarization will be induced when a charge current flows through the surface of a TI. Such spin polarization can be detected by using a ferromagnetic tunneling contact as a detector. In this talk, we present our results measured in devices fabricated from BiSbTeSe₂ flakes. Spin signals were observed in both n-type and p-type BiSbTeSe₂ samples.