Electrical detection of spin-polarized current in topological insulator Bi1.5Sb0.5Te1.7Se1.3 |
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Institution: | 1. Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju 61005, South Korea;2. Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, Pohang 790-784, Republic of Korea;3. Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea |
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Abstract: | Spin-momentum locked (SML) topological surface state (TSS) provides exotic properties for spintronics applications. The spin-polarized current, which emerges owing to the SML, can be directly detected by performing spin potentiometric measurement. We observed spin-polarized current using a bulk insulating topological insulator (TI), Bi1.5Sb0.5Te1.7Se1.3, and Co as the ferromagnetic spin probe. The spin voltage was probed with varying the bias current, temperature, and gate voltage. Moreover, we observed non-local spin-polarized current, which is regarded as a distinguishing property of TIs. The spin-polarization ratio of the non-local current was larger than that of the local current. These findings could reveal a more accurate approach to determine spin-polarization ratio at the TSS. |
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Keywords: | Topological insulator Spin-momentum locking Electrical spin detection Non-local current |
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