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Intrinsic ferromagnetism and quantum anomalous Hall effect in a CoBr2 monolayer

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Abstract

The electronic, magnetic, and topological properties of a CoBr2 monolayer are studied in the framework of density-functional theory (DFT) combined with tight-binding (TB) modeling in terms of the Wannier basis. Our DFT investigation and Monte Carlo simulation show that there exists intrinsic two-dimensional ferromagnetism in the CoBr2 monolayer, thanks to the large out-of-plane magnetocrystalline anisotropic energy. Our further study indicates that the spin–orbit coupling makes it become a topologically nontrivial insulator with a quantum anomalous Hall effect and topological Chern number [script C] = 4 and its edge states can be manipulated by changing the width of its nanoribbons and applying strains. The CoBr2 monolayer can be exfoliated from the layered CoBr2 bulk material because its exfoliation energy is between those of graphene and the MoS2 monolayer and it is dynamically stable. These results make us believe that the CoBr2 monolayer can make a promising spintronic material for future high-performance devices.

Graphical abstract: Intrinsic ferromagnetism and quantum anomalous Hall effect in a CoBr2 monolayer

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Publication details

The article was received on 04 Apr 2017, accepted on 11 May 2017 and first published on 11 May 2017


Article type: Communication
DOI: 10.1039/C7CP02158E
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
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    Intrinsic ferromagnetism and quantum anomalous Hall effect in a CoBr2 monolayer

    P. Chen, J. Zou and B. Liu, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C7CP02158E

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