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First-principles prediction of quantum anomalous Hall effect in two-dimensional Co2Te lattice |
| Yuan-Shuo Liu(刘元硕), Hao Sun(孙浩), Chun-Sheng Hu(胡春生), Yun-Jing Wu(仵允京), and Chang-Wen Zhang(张昌文)† |
| School of Physics and Technology, University of Jinan, Jinan 250022, China |
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Abstract The quantum anomalous Hall effect (QAHE) has special quantum properties that are ideal for possible future spintronic devices. However, the experimental realization is rather challenging due to its low Curie temperature and small non-trivial bandgap in two-dimensional (2D) materials. In this paper, we demonstrate through first-principles calculations that monolayer Co$_{2}$Te material is a promising 2D candidate to realize QAHE in practice. Excitingly, through Monte Carlo simulations, it is found that the Curie temperature of single-layer Co$_{2}$Te can reach 573 K. The band crossing at the Fermi level in monolayer Co$_{2}$Te is opened when spin-orbit coupling is considered, which leads to QAHE with a sizable bandgap of $E_{\rm g} = 96$ meV, characterized by the non-zero Chern number $\left( C = 1 \right)$ and a chiral edge state. Therefore, our findings not only enrich the study of quantum anomalous Hall effect, but also broaden the horizons of the spintronics and topological nanoelectronics applications.
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Received: 24 July 2022
Revised: 03 November 2022
Accepted manuscript online: 07 November 2022
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PACS:
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71.15.Mb
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(Density functional theory, local density approximation, gradient and other corrections)
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73.43.-f
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(Quantum Hall effects)
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73.63.-b
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(Electronic transport in nanoscale materials and structures)
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| Fund: Project supported by the Taishan Scholar Program of Shandong Province, China (Grant No. ts20190939), the Independent Cultivation Program of Innovation Team of Jinan City (Grant No. 2021GXRC043), and the National Natural Science Foundation of China (Grant No. 52173238). |
Corresponding Authors:
Chang-Wen Zhang
E-mail: ss_zhangchw@ujn.edu.cn
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Cite this article:
Yuan-Shuo Liu(刘元硕), Hao Sun(孙浩), Chun-Sheng Hu(胡春生), Yun-Jing Wu(仵允京), and Chang-Wen Zhang(张昌文) First-principles prediction of quantum anomalous Hall effect in two-dimensional Co2Te lattice 2023 Chin. Phys. B 32 027101
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