Offidani, Manuel orcid.org/0000-0002-3500-8198 and Ferreira, Aires Francisco orcid.org/0000-0001-6017-8669 (2018) Anomalous Hall Effect in 2D Dirac Materials. Physical Review Letters. 126802. ISSN 1079-7114
Abstract
We present a unified theory of charge carrier transport in 2D Dirac systems with broken mirror inversion and time-reversal symmetries (e.g., as realized in ferromagnetic graphene). We find that the entanglement between spin and pseudospin SU(2) degrees of freedom stemming from spin-orbit effects leads to a distinctive gate voltage dependence (change of sign) of the anomalous Hall conductivity approaching the topological gap, which remains robust against impurity scattering and thus is a smoking gun for magnetized 2D Dirac fermions. Furthermore, we unveil a robust skew scattering mechanism, modulated by the spin texture of the energy bands, which causes a net spin accumulation at the sample boundaries even for spin-transparent disorder. The newly unveiled extrinsic spin Hall effect is readily tunable by a gate voltage and opens novel opportunities for the control of spin currents in 2D ferromagnetic materials.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2018 American Physical Society. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details |
Keywords: | graphene,2d materials,anomalous hall effect,spin orbit coupling,spin orbit effects,Spin transport |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) |
Funding Information: | Funder Grant number EPSRC EP/N004817/1 THE ROYAL SOCIETY RGF\EA\180276 |
Depositing User: | Pure (York) |
Date Deposited: | 19 Sep 2018 11:00 |
Last Modified: | 16 Oct 2024 15:06 |
Published Version: | https://doi.org/10.1103/PhysRevLett.121.126802 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1103/PhysRevLett.121.126802 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:135944 |