Taskin, A. A., Legg, Henry F., Yang, Fan ORCID: 0000-0001-6841-1605, Sasaki, Satoshi, Kanai, Yasushi ORCID: 0000-0002-6501-9699, Matsumoto, Kazuhiko, Rosch, Achim ORCID: 0000-0002-6586-5721 and Ando, Yoichi ORCID: 0000-0002-3553-3355 (2017). Planar Hall effect from the surface of topological insulators. Nat. Commun., 8. LONDON: NATURE PUBLISHING GROUP. ISSN 2041-1723

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Abstract

A prominent feature of topological insulators (TIs) is the surface states comprising of spin-nondegenerate massless Dirac fermions. Recent technical advances have made it possible to address the surface transport properties of TI thin films by tuning the Fermi levels of both top and bottom surfaces. Here we report our discovery of a novel planar Hall effect (PHE) from the TI surface, which results from a hitherto-unknown resistivity anisotropy induced by an in-plane magnetic field. This effect is observed in dual-gated devices of bulk-insulating Bi2-xSbxTe3 thin films, where the field-induced anisotropy presents a strong dependence on the gate voltage with a characteristic two-peak structure near the Dirac point. The origin of PHE is the peculiar time-reversal-breaking effect of an in-plane magnetic field, which anisotropically lifts the protection of surface Dirac fermions from backscattering. The observed PHE provides a useful tool to analyze and manipulate the topological protection of the TI surface.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Taskin, A. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Legg, Henry F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yang, FanUNSPECIFIEDorcid.org/0000-0001-6841-1605UNSPECIFIED
Sasaki, SatoshiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
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:38-211431
DOI: 10.1038/s41467-017-01474-8
Journal or Publication Title: Nat. Commun.
Volume: 8
Date: 2017
Publisher: NATURE PUBLISHING GROUP
Place of Publication: LONDON
ISSN: 2041-1723
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
ANISOTROPIC MAGNETORESISTANCE; STATESMultiple languages
Multidisciplinary SciencesMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/21143

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