Electric control of Dirac quasiparticles by spin-orbit torque in an antiferromagnet

Šmejkal, L. and Železný, J. and Sinova, J. and Jungwirth, T. (2017) Electric control of Dirac quasiparticles by spin-orbit torque in an antiferromagnet. Physical Review Letters, 118 (10). ISSN 1079-7114

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Abstract

Spin orbitronics and Dirac quasiparticles are two fields of condensed matter physics initiated independently about a decade ago. Here we predict that Dirac quasiparticles can be controlled by the spin-orbit torque reorientation of the Néel vector in an antiferromagnet. Using CuMnAs as an example, we formulate symmetry criteria allowing for the coexistence of topological Dirac quasiparticles and Néel spin-orbit torques. We identify the nonsymmorphic crystal symmetry protection of Dirac band crossings whose on and off switching is mediated by the Néel vector reorientation. We predict that this concept verified by minimal model and density functional calculations in the CuMnAs semimetal antiferromagnet can lead to a topological metal-insulator transition driven by the Néel vector and to the topological anisotropic magnetoresistance.

Item Type: Article
Additional Information: © 2017 American Physical Society
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1103/PhysRevLett.118.106402
Depositing User: Eprints, Support
Date Deposited: 14 Jul 2017 15:15
Last Modified: 14 Jul 2017 20:48
URI: http://eprints.nottingham.ac.uk/id/eprint/44178

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