Intrinsic valley-polarized quantum anomalous Hall effect in a two-dimensional germanene/MnI2 van der Waals heterostructure

doi:10.1088/1674-1056/ad4bbd

Abstract Valley-polarized quantum anomalous Hall effect (VQAHE), combined nontrivial band topology with valleytronics, is of importance for both fundamental sciences and emerging applications. However, the experimental realization of this property is challenging. Here, by using first-principles calculations and modal analysis, we predict a mechanism of producing VQAHE in two-dimensional ferromagnetic van der Waals germanene/MnI$_{2}$ heterostructure. This heterostructure exhibits both valley anomalous Hall effect and VQAHE due to the joint effects of magnetic exchange effect and spin-orbital coupling with the aid of anomalous Hall conductance and chiral edge state. Moreover interestingly, through the electrical modulation of ferroelectric polarization state in In$_{2}$Se$_{3}$, the germanene/MnI$_{2}$/In$_{2}$Se$_{3}$ heterostructure can undergo reversible switching from a semiconductor to a metallic behavior. This work offers a guiding advancement for searching for VQAHE in ferromagnetic van der Waals heterostructures and exploiting energy-efficient devices based on the VQAHE.

Keywords: valley-polarized quantum anomalous Hall effect ferromagnetic

Received: 31 January 2024
Revised: 24 April 2024
Accepted manuscript online: 15 May 2024

PACS:	73.43.-f	(Quantum Hall effects)
	73.22.-f	(Electronic structure of nanoscale materials and related systems)
	71.15.Mb	(Density functional theory, local density approximation, gradient and other corrections)
	79.60.Jv	(Interfaces; heterostructures; nanostructures)

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

Cite this article:

Xiao-Jing Dong(董晓晶) and Chang-Wen Zhang(张昌文) Intrinsic valley-polarized quantum anomalous Hall effect in a two-dimensional germanene/MnI₂ van der Waals heterostructure 2024 Chin. Phys. B 33 077303

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Intrinsic valley-polarized quantum anomalous Hall effect in a two-dimensional germanene/MnI2 van der Waals heterostructure

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Intrinsic valley-polarized quantum anomalous Hall effect in a two-dimensional germanene/MnI₂ van der Waals heterostructure