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Issue 32, 2019
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Two-dimensional transition-metal halide CoBr3 with spin-polarized Dirac cone

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Abstract

Recently, the discovery of two-dimensional transition-metal materials with non-trivial magnetic and electronic properties has spurred huge interest in investigating their applications in nanotechnology. Here, we report that the monolayer of CoBr3 possesses a quantum anomalous Hall insulating phase generated on the basis of first-principles calculations. We find that the CoBr3 monolayer is an intrinsic two-dimensional ferromagnetic material with a Curie temperature Tc = 264 K predicted from Monte Carlo simulations. The phonon spectra analysis indicates that the CoBr3 monolayer is dynamically stable. Taking into account spin–orbit coupling, this makes the electronic structure of the CoBr3 monolayer topologically non-trivial with a global band gap of 8.7 meV. The anomalous Hall conductivity calculation shows a Chern number C = 2, meaning the presence of a two edge state in nanoribbons of finite width. These findings not only add an experimentally feasible member to the quantum anomalous Hall insulator family, but also pave the way for highly promising application potentials in nanoelectronics and spintronics.

Graphical abstract: Two-dimensional transition-metal halide CoBr3 with spin-polarized Dirac cone

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Article information


Submitted
12 Jun 2019
Accepted
18 Jul 2019
First published
18 Jul 2019

Phys. Chem. Chem. Phys., 2019,21, 17740-17745
Article type
Paper

Two-dimensional transition-metal halide CoBr3 with spin-polarized Dirac cone

W. Zhang, Y. Li, H. Jin and Y. She, Phys. Chem. Chem. Phys., 2019, 21, 17740
DOI: 10.1039/C9CP03337H

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