Quantum anomalous Hall effect and Anderson-Chern insulating regime in the noncollinear antiferromagnetic 3Q state

Papa Birame Ndiaye, Adel Abbout, V. M. L. D. P. Goli, Aurelien Manchon

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Abstract

We investigate the emergence of both quantum anomalous Hall and disorder-induced Anderson-Chern insulating phases in two-dimensional hexagonal lattices, with an antiferromagnetically ordered 3Q state and in the absence of spin-orbit coupling. Using tight-binding modeling, we show that such systems display not only a spin-polarized edge-localized current, the chirality of which is energy dependent, but also an impurity-induced transition from trivial metallic to topological insulating regimes, through one edge mode plateau. We compute the gaps' phase diagrams and demonstrate the robustness of the edge channel against deformation and disorder. Our study hints at the 3Q state as a promising building block for dissipationless spintronics based on antiferromagnets.
Original languageEnglish (US)
JournalPhysical Review B
Volume100
Issue number14
DOIs
StatePublished - Oct 28 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): Grant No. OSR-2015-CRG4-2626
Acknowledgements: The authors thank F. Piéchon, Z. Thiam, G. E. W. Bauer, K.-J. Lee, X. R. Wang, and H. Bahlouli for valuable discussions. We also acknowledge computing time on the supercomputers SHAHEEN at the KAUST Supercomputing Centre and the team assistance. This work was supported by the King Abdullah University of Science and Technology (KAUST) through the Office of Sponsored Research (OSR) under Grant No. OSR-2015-CRG4-2626. P.B.N. acknowledges the support provided by the Deanship of Scientific Research at King Fahd University of Petroleum and Minerals (KFUPM) through Project No. SR181002.

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