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We detected the spin polarization due to charge flow in the spinnon-degenerate surface state of a three dimensional topological insulator bymeans of an all-electrical method. The charge current in the bulk-insulatingtopological insulator Bi1.5Sb0.5Te1.7Se1.3 (BSTS) was injected/extractedthrough a ferromagnetic electrode made of Ni80Fe20, and an unusualcurrent-direction-dependent magnetoresistance gives evidence for the appearanceof spin polarization which leads to a spin-dependent resistance at theBSTS/Ni80Fe20 interface. In contrast, our control experiment on Bi2Se3 gavenull result. These observations demonstrate the importance of the Fermi-levelcontrol for the electrical detection of the spin polarization in topologicalinsulators.

Electrical detection of the spin polarization due to charge flow in the surface state of the topological insulator Bi_1.5 Sb_0.5 Te_1.7 Se_1.3