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

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

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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 pro-ducing VQAHE in two-dimensional ferromagnetic van der Waals germanene/MnI2 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 In2Se3,the germanene/MnI2/In2Se3 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.

valley-polarizedquantum anomalous Hall effectferromagnetic

董晓晶、张昌文

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School of Physics and Technology,Institute of Spintronics,University of Jinan,Jinan 250022,China

School of Physics and Physical Engineering,Qufu Normal University,Qufu 273100,China

National Natural Science Foundation of ChinaTaishan Scholar Program of Shandong ProvinceIndependent Cultivation Program of Innovation Team of Jinan City

52173283ts201909392021GXRC043

2024

10.1088/1674-1056/ad4bbd

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(7)
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