Milletari, Mirco, Offidani, Manuel orcid.org/0000-0002-3500-8198, Ferreira, Aires Francisco orcid.org/0000-0001-6017-8669 et al. (1 more author) (2017) Covariant Conservation Laws and the Spin Hall Effect in Dirac-Rashba Systems. Physical Review Letters. 246801. ISSN 1079-7114
Abstract
We present a theoretical analysis of two-dimensional Dirac-Rashba systems in the presence of disorder and external perturbations. We unveil a set of exact symmetry relations (Ward identities) that impose strong constraints on the spin dynamics of Dirac fermions subject to proximity-induced interactions. This allows us to demonstrate that an arbitrary dilute concentration of scalar impurities results in the total suppression of nonequilibrium spin Hall currents when only Rashba spin-orbit coupling is present. Remarkably, a finite spin Hall conductivity is restored when the minimal Dirac-Rashba model is supplemented with a spin–valley interaction. The Ward identities provide a systematic way to predict the emergence of the spin Hall effect in a wider class of Dirac-Rashba systems of experimental relevance and represent an important benchmark for testing the validity of numerical methodologies.
Metadata
Item Type: | Article | ||||
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Copyright, Publisher and Additional Information: | © 2017 American Physical Society. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details | ||||
Dates: |
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Institution: | The University of York | ||||
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) | ||||
Funding Information: |
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Depositing User: | Pure (York) | ||||
Date Deposited: | 21 Dec 2017 09:20 | ||||
Last Modified: | 21 Mar 2024 23:29 | ||||
Published Version: | https://doi.org/10.1103/PhysRevLett.119.246801 | ||||
Status: | Published | ||||
Refereed: | Yes | ||||
Identification Number: | https://doi.org/10.1103/PhysRevLett.119.246801 | ||||
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