Magnetic field induced valley-polarized quantum anomalous Hall effects in ferromagnetic van der Waals heterostructures

Zhan, Fangyang1,2,3; Zheng, Baobing1,2,3,4; Xiao, Xiaoliang1,2,3; Fan, Jing5; Wu, Xiaozhi1,2,3; Wang, Rui1,2,5,6

2022-01-21

10.1103/PhysRevB.105.035131

PHYSICAL REVIEW B   影响因子和分区

2469-9950

2469-9969

The valley-polarized quantum anomalous Hall effect (VQAHE) attracts intensive interest since it uniquely combines valleytronics and spintronics with nontrivial band topology. Here, based on first-principles calculations and the Wannier-function-based tight-binding model, we reveal that valley-based Hall effects and especially the VQAHE induced by external magnetic fields can occur in two-dimensional (2D) ferromagnetic van der Waals heterostructures (vdWHs). The results show that valley splitting derived from the Zeeman exchange energy drives these vdWHs generating the valley anomalous Hall effect and then the VQAHE. The chiral edge states and quantized Hall conductance are utilized to confirm the presence of VQAHE. Besides, it is also found that applying external electric fields (or tuning interlayer distances) can facilitate the realization of VQAHE, and thus we present a phase diagram in a broad parameter regime of magnetic fields and electric fields (or interlayer distances). Our work not only offers a class of ferromagnetic vdWHs to realize various valley-based Hall phases, but also can guide advancements for designing topological devices with spin-valley filtering effects based on the VQAHE.

SCI ; EI

英语

其他

National Natural Science Foundation of China (NSFC)[11974062,12147102,11704177] ; Chongqing Natural Science Foundation[cstc2019jcyj-msxmX0563] ; Graduate Scientific Research and Innovation Foundation of Chongqing of China[CYS20042]

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000760333400001

AMER PHYSICAL SOC

20220511577302

Calculations ; Electric fields ; Ferromagnetic materials ; Ferromagnetism ; Quantum Hall effect ; Topology ; Van der Waals forces

Geology:481.1 ; Electricity: Basic Concepts and Phenomena:701.1 ; Magnetism: Basic Concepts and Phenomena:701.2 ; Magnetic Materials:708.4 ; Physical Chemistry:801.4 ; Mathematics:921 ; Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4 ; Classical Physics; Quantum Theory; Relativity:931 ; Atomic and Molecular Physics:931.3

PHYSICS

Web of Science

1.Chongqing Univ, Inst Struct & Funct, Chongqing 400044, Peoples R China
2.Chongqing Univ, Dept Phys, Chongqing 400044, Peoples R China
3.Chongqing Key Lab Strongly Coupled Phys, Chongqing 400044, Peoples R China
4.Baoji Univ Arts & Sci, Coll Phys & Optoelect Technol, Baoji 721016, Peoples R China
5.Southern Univ Sci & Technol, Ctr Computat Sci & Engn, Shenzhen 518055, Peoples R China
6.Chongqing Univ, Ctr Quantum Mat & Devices, Chongqing 400044, Peoples R China

Zhan, Fangyang,Zheng, Baobing,Xiao, Xiaoliang,et al. Magnetic field induced valley-polarized quantum anomalous Hall effects in ferromagnetic van der Waals heterostructures[J]. PHYSICAL REVIEW B,2022,105(3).

Zhan, Fangyang,Zheng, Baobing,Xiao, Xiaoliang,Fan, Jing,Wu, Xiaozhi,&Wang, Rui.(2022).Magnetic field induced valley-polarized quantum anomalous Hall effects in ferromagnetic van der Waals heterostructures.PHYSICAL REVIEW B,105(3).

Zhan, Fangyang,et al."Magnetic field induced valley-polarized quantum anomalous Hall effects in ferromagnetic van der Waals heterostructures".PHYSICAL REVIEW B 105.3(2022).