| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Electronic property and topological phase transition in a graphene/CoBr2 heterostructure |
| Yuan-Xiu Qin(秦元秀), Sheng-Shi Li(李胜世), Wei-Xiao Ji(纪维霄), and Chang-Wen Zhang(张昌文)† |
| School of Physics and Technology, Institute of Spintronics, University of Jinan, Jinan 250022, China |
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Abstract Recently, significant experimental advancements in achieving topological phases have been reported in van der Waals (vdW) heterostructures involving graphene. Here, using first-principles calculations, we investigate graphene/CoBr$_{2}$ (Gr/CoBr$_{2}$) heterostructures and find that an enhancement of in-plane magnetic anisotropy (IMA) energy in monolayer CoBr$_{2}$ can be accomplished by reducing the interlayer distance of the vdW heterostructures. In addition, we clarify that the enhancement of IMA energy primarily results from two factors: one is the weakness of the Co-d$_{xy}$ and Co-d$_{x^{2}-y^{2}}$ orbital hybridization and the other is the augmentation of the Co-d$_{yz}$ and Co-d$_{z^{2}}$ orbital hybridization. Meanwhile, calculation results suggest that the Kosterlitz-Thouless phase transition temperature ($T_{\rm KT}$) of a 2D $XY$ magnet Gr/CoBr$_{2}$ (23.8 K) is higher than that of a 2D $XY$ monolayer CoBr$_{2}$ (1.35 K). By decreasing the interlayer distances, the proximity effect is more pronounced and band splitting appears. Moreover, by taking into account spin-orbit coupling, a band gap of approximately 14.3 meV and the quantum anomalous Hall effect (QAHE) are attained by decreasing the interlayer distance by 1.0 Å. Inspired by the above conclusions, we design a topological field transistor device model. Our results support that the vdW interlayer distance can be used to modulate the IMA energy and QAHE of materials, providing a pathway for the development of new low-power spintronic devices.
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Received: 08 October 2023
Revised: 24 November 2023
Accepted manuscript online: 24 November 2023
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PACS:
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79.60.Jv
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(Interfaces; heterostructures; nanostructures)
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75.30.Gw
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(Magnetic anisotropy)
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64.70.Tg
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(Quantum phase transitions)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 52173283), Taishan Scholar Program of Shandong Province (Grant No. ts20190939), and Independent Cultivation Program of Innovation Team of Jinan City (Grant No. 2021GXRC043). |
Corresponding Authors:
Chang-Wen Zhang
E-mail: ss_zhangchw@ujn.edu.cn
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Cite this article:
Yuan-Xiu Qin(秦元秀), Sheng-Shi Li(李胜世), Wei-Xiao Ji(纪维霄), and Chang-Wen Zhang(张昌文) Electronic property and topological phase transition in a graphene/CoBr2 heterostructure 2024 Chin. Phys. B 33 027901
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