Controlled transport on the surface of a topological insulator by biased transverse electric field
1 Nanjing University of Posts & Telecommunications, School of Electronic Science & Engineering Nanjing 210046, Jiangsu, China
2 Huaiyin Institute of Technology, School of Mathematics & Physics - Huaian 223003, China, and Electrical and Computer Engineering Department, National University of Singapore 4 Engineering Drive 3, 117576, Singapore
Received: 14 January 2015
Accepted: 30 July 2015
We report on the biased transverse electric field sensitive transport of Dirac fermions on the surface of a three-dimensional topological insulator modulated by magnetic superlattices. By using a scattering matrix method, we find that the transmission spectrum for both parallel and antiparallel configurations exhibits asymmetrical features. In addition, the analysis of conductances in different magnetic configurations allows us to obtain controlled magnetoresistence depending on the amplitude of the external electric field. These might make topological insulators good candidates for future spintronics.
PACS: 03.65.Vf – Phases: geometric; dynamic or topological / 72.25.Dc – Spin polarized transport in semiconductors / 75.47.-m – Magnetotransport phenomena; materials for magnetotransport
© EPLA, 2015