Yang, Fan ORCID: 0000-0001-6841-1605, Ghatak, Subhamoy, Taskin, A. A., Segawa, Kouji, Ando, Yuichiro, Shiraishi, Masashi ORCID: 0000-0003-0592-2824, Kanai, Yasushi ORCID: 0000-0002-6501-9699, Matsumoto, Kazuhiko, Rosch, Achim ORCID: 0000-0002-6586-5721 and Ando, Yoichi ORCID: 0000-0002-3553-3355 (2016). Switching of charge-current-induced spin polarization in the topological insulator BiSbTeSe2. Phys. Rev. B, 94 (7). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

The charge-current-induced spin polarization is a key property of topological insulators for their applications in spintronics. However, topological surface states are expected to give rise to only one type of spin polarization for a given current direction, which has been a limiting factor for spin manipulations. Here, we report that in devices based on the bulk-insulating topological insulator BiSbTeSe2, an unexpected switching of spin polarization was observed upon changing the chemical potential. The spin polarization expected from the topological surface states was detected in a heavily electron-doped device, whereas the opposite polarization was reproducibly observed in devices with low carrier densities. We propose that the latter type of spin polarization stems from topologically trivial two-dimensional states with a large Rashba spin splitting, which are caused by a strong band bending at the surface of BiSbTeSe2 beneath the ferromagnetic electrode used as a spin detector. This finding paves the way for realizing the spin transistor operation in future topological spintronic devices.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Yang, FanUNSPECIFIEDorcid.org/0000-0001-6841-1605UNSPECIFIED
Ghatak, SubhamoyUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Taskin, A. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Segawa, KoujiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ando, YuichiroUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Shiraishi, MasashiUNSPECIFIEDorcid.org/0000-0003-0592-2824UNSPECIFIED
Kanai, YasushiUNSPECIFIEDorcid.org/0000-0002-6501-9699UNSPECIFIED
Matsumoto, KazuhikoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rosch, AchimUNSPECIFIEDorcid.org/0000-0002-6586-5721UNSPECIFIED
Ando, YoichiUNSPECIFIEDorcid.org/0000-0002-3553-3355UNSPECIFIED
URN: urn:nbn:de:hbz:38-266775
DOI: 10.1103/PhysRevB.94.075304
Journal or Publication Title: Phys. Rev. B
Volume: 94
Number: 7
Date: 2016
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 2469-9969
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
ELECTRICAL DETECTION; SURFACE; INJECTION; MAGNETIZATION; GRAPHENE; TORQUE; STATE; METALMultiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/26677

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