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Title: All-electric spin modulator based on a two-dimensional topological insulator

We propose and investigate a spin modulator device consisting of two ferromagnetic leads connected by a two-dimensional topological insulator as the channel material. It exploits the unique features of the topological spin-helical edge states, such that the injected carriers with a non-collinear spin-polarization direction would travel through both edges and show interference effect. The conductance of the device can be controlled in a simple and all-electric manner by a side-gate voltage, which effectively rotates the spin-polarization of the carrier. At low voltages, the rotation angle is linear in the gate voltage, and the device can function as a good spin-polarization rotator by replacing the drain electrode with a non-magnetic material.
Authors:
;  [1] ; ;  [2] ;  [3] ;  [4]
  1. School of Computer Science, Jiangxi University of Traditional Chinese Medicine, Nanchang 330004 (China)
  2. Research Laboratory for Quantum Materials, Singapore University of Technology and Design, Singapore 487372 (Singapore)
  3. School of Science, East China Jiaotong University, Nanchang 330013 (China)
  4. Key Laboratory for Low-Dimensional Structures and Quantum Manipulation (Ministry of Education), and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha 410081 (China)
Publication Date:
OSTI Identifier:
22489319
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 108; Journal Issue: 3; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CARRIERS; ELECTRIC POTENTIAL; INTERFERENCE; MAGNETIC MATERIALS; SPIN; SPIN ORIENTATION; TOPOLOGY; TWO-DIMENSIONAL SYSTEMS