Abstract

We propose a highly tunable 100% spin-polarized current generated in a spintronic device based on a Dirac semimetal (DSM) under a magnetic field, which can be achieved merely by controlling electrical parameters, i.e. the gate voltage, the chemical potential in the lead and the coupling strength between the leads and the DSM. These parameters are all related to the special properties of a semimetal. The spin polarized current generated by gate voltage is guaranteed by its semimetallic feature, because of which the density of state vanishes near Dirac nodes. The barrier controlled current results from the different distance of Weyl nodes generated by the Zeeman field. And the coupling strength controlled spin polarized current originates from the surface Fermi arcs. This DSM-based spintronic device is expected to be realized in Cd3As2 experimentally.

Details

Title
Electrically controlled spin polarized current in Dirac semimetals
Author
Lv Qianqian 1 ; Pei-Hao, Fu 1 ; Xiang-Long, Yu 2 ; Jun-Feng, Liu 3 ; Wu, Jiansheng 4 

1  Harbin Institute of Technology, Department of Physics, Harbin, China (GRID:grid.19373.3f) (ISNI:0000 0001 0193 3564); Southern University of Science and Technology, Department of Physics, Shenzhen, China (GRID:grid.263817.9) (ISNI:0000 0004 1773 1790); Southern University of Science and Technology, Shenzhen Institute for Quantum Science and Engineering (SIQSE), Shenzhen, China (GRID:grid.263817.9) (ISNI:0000 0004 1773 1790) 
2  Southern University of Science and Technology, Department of Physics, Shenzhen, China (GRID:grid.263817.9) (ISNI:0000 0004 1773 1790); Southern University of Science and Technology, Shenzhen Institute for Quantum Science and Engineering (SIQSE), Shenzhen, China (GRID:grid.263817.9) (ISNI:0000 0004 1773 1790) 
3  Guangzhou University, School of Physics and Materials Science, Guangzhou, China (GRID:grid.411863.9) (ISNI:0000 0001 0067 3588) 
4  Southern University of Science and Technology, Department of Physics, Shenzhen, China (GRID:grid.263817.9) (ISNI:0000 0004 1773 1790); Southern University of Science and Technology, Shenzhen Institute for Quantum Science and Engineering (SIQSE), Shenzhen, China (GRID:grid.263817.9) (ISNI:0000 0004 1773 1790); Hefei National Laboratory, Futian District, International Quantum Academy (SIQA), and Shenzhen Branch, Shenzhen, P. R. China (GRID:grid.263817.9) 
Publication year
2021
Publication date
2021
Publisher
Nature Publishing Group
e-ISSN
20452322
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1038/s41598-021-01067-y
ProQuest document ID
2591866953
Copyright
© The Author(s) 2021. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.