Planar Hall effect from the surface of topological insulators.

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 Bi_2-x Sb _x Te₃ 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-re

SUBMITTER: Taskin AA 

PROVIDER: S-EPMC5673905 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature