Valley-polarized quantum anomalous Hall effect in van der Waals heterostructures based on monolayer jacutingaite family materials

doi:10.1007/s11467-022-1228-4

Frontiers of Physics

2023, Vol. 18

Issue (2): 23302 https://doi.org/10.1007/s11467-022-1228-4

本期目录

Valley-polarized quantum anomalous Hall effect in van der Waals heterostructures based on monolayer jacutingaite family materials

Xudong Zhu^1,², Yuqian Chen^1,², Zheng Liu^1,²(

), Yulei Han³(

), Zhenhua Qiao^1,²(

)

¹. ICQD, Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China
². CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, and Department of Physics, University of Science and Technology of China, Hefei 230026, China
³. Department of Physics, Fuzhou University, Fuzhou 350108, China

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Abstract：

We numerically study the general valley polarization and anomalous Hall effect in van der Waals (vdW) heterostructures based on monolayer jacutingaite family materials Pt₂AX₃ (A = Hg, Cd, Zn; X = S, Se, Te). We perform a systematic study on the atomic, electronic, and topological properties of vdW heterostructures composed of monolayer Pt₂AX₃ and two-dimensional ferromagnetic insulators. We show that four kinds of vdW heterostructures exhibit valley-polarized quantum anomalous Hall phase, i.e., Pt₂HgS₃/NiBr₂, Pt₂HgSe₃/CoBr₂, Pt₂HgSe₃/NiBr₂, and Pt₂ZnS₃/CoBr₂, with a maximum valley splitting of 134.2 meV in Pt₂HgSe₃/NiBr₂ and sizable global band gap of 58.8 meV in Pt₂HgS₃/NiBr₂. Our findings demonstrate an ideal platform to implement applications on topological valleytronics.

Key words： quantum anomalous Hall effect valley polarization topological valleytronics transition metal dichalcogenides jacutingaite family materials first-principles calculations van der Waals heterostructure

收稿日期: 2022-09-25 出版日期: 2022-12-12

Corresponding Author(s): Zheng Liu,Yulei Han,Zhenhua Qiao

引用本文:

. [J]. Frontiers of Physics, 2023, 18(2): 23302.
Xudong Zhu, Yuqian Chen, Zheng Liu, Yulei Han, Zhenhua Qiao. Valley-polarized quantum anomalous Hall effect in van der Waals heterostructures based on monolayer jacutingaite family materials. Front. Phys. , 2023, 18(2): 23302.

链接本文:

https://academic.hep.com.cn/fop/CN/10.1007/s11467-022-1228-4
https://academic.hep.com.cn/fop/CN/Y2023/V18/I2/23302

Fig.1

Fig.2

vdW Heterostructures	Pt $2$ HgS $3$ / CoBr $2$	Pt $2$ HgSe $3$ / CoBr $2$	Pt $2$ HgTe $3$ / CoBr $2$	Pt $2$ ZnS $3$ / CoBr $2$	Pt $2$ HgS $3$ / NiBr $2$	Pt $2$ HgSe $3$ / NiBr $2$	Pt $2$ CdS $3$ / NiBr $2$	Pt $2$ ZnSe $3$ / NiBr $2$

$Δ Q$ ( $e$ )	−0.17	−0.20	−0.09	−0.32	−0.03	−0.11	−0.18	−0.17
$d$ (Å)	2.51	2.74	2.90	2.70	2.28	2.46	2.18	2.51
$M jac$ $(μ B)$	0.330	0.061	0.068	0.050	0.219	0.204	0.276	0.167
$M tot$ $(μ B)$	11.525	11.530	11.490	11.503	7.453	7.446	7.392	7.420
$M A 1$ $(μ B)$	0.005	−0.009	−0.005	−0.014	−0.016	−0.021	−0.020	0.009
$M A 2$ $(μ B)$	0.056	0.016	0.007	0.024	0.067	0.045	0.104	0.027

Tab.1

Fig.3

Fig.4

Nontrivial vdW heterostructrues	$Δ$ (meV)	$E g$ (meV)	$Δ K$ (meV)	$Δ K ′$ (meV)	$C$

Pt $2$ HgSe $3$ /NiBr $2$	134.2	6.3	182.8	73.5	−1
Pt $2$ ZnS $3$ /CoBr $2$	36.3	7.8	185.9	59.9	−1
Pt $2$ HgS $3$ /NiBr $2$	15.4	58.8	74.2	78.8	1
Pt $2$ HgSe $3$ /CoBr $2$	3.5	19.3	22.8	124.0	1

Tab.2

Fig.5

Fig.6

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