Universität zu Köln

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

Full text not available from this repository.

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:	Creators Email ORCID ORCID Put Code Taskin, A. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Legg, Henry F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Yang, Fan UNSPECIFIED orcid.org/0000-0001-6841-1605 UNSPECIFIED Sasaki, Satoshi UNSPECIFIED UNSPECIFIED UNSPECIFIED Kanai, Yasushi UNSPECIFIED orcid.org/0000-0002-6501-9699 UNSPECIFIED Matsumoto, Kazuhiko UNSPECIFIED UNSPECIFIED UNSPECIFIED Rosch, Achim UNSPECIFIED orcid.org/0000-0002-6586-5721 UNSPECIFIED Ando, Yoichi UNSPECIFIED orcid.org/0000-0002-3553-3355 UNSPECIFIED
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:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ANISOTROPIC MAGNETORESISTANCE; STATES Multiple languages Multidisciplinary Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/21143