Intrinsic quantum anomalous Hall phase induced by proximity in the van der Waals heterostructure germanene/Cr2Ge2Te6

Zou, Runling1,2; Zhan, Fangyang1,2; Zheng, Baobing3; Wu, Xiaozhi1,2; Fan, Jing4; Wang, Rui1,2,5

2020-04-13

10.1103/PhysRevB.101.161108

PHYSICAL REVIEW B   影响因子和分区

2469-9950

2469-9969

A van der Waals heterostructure combined with intrinsic magnetism and topological orders have recently paved attractive avenues to realize quantum anomalous Hall effects. In this work, using first-principles calculations and effective model analysis, we propose that the robust quantum anomalous Hall states with sizable band gaps emerge in the van der Waals heterostructure of germanene/Cr2Ge2Te6. This heterostructure possesses high thermodynamic stability, thus facilitating its experimental fabrication. Furthermore, we uncover that the proximity effect enhances the coupling between the germanene and Cr2Ge2Te6 layers, inducing the nontrivial band gaps in a wide range from 29 to 72 meV. The chiral edge states inside the band gap, leading to Hall conductance quantized to -e(2)/h, are clearly visible. These findings provide an ideal candidate to detect the quantum anomalous Hall states and realize further applications to nontrivial quantum transport at a high temperature.

SCI ; EI

英语

其他

Fundamental Research Funds for the Central Universities of China[2019CDXYWL0029]

Materials Science ; Physics

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

WOS:000525327200001

AMER PHYSICAL SOC

20202008646213

Quantum theory ; Tellurium compounds ; Van der Waals forces ; Chromium compounds ; Germanium compounds ; Energy gap ; Quantum Hall effect ; Germanium alloys ; Quantum chemistry ; High temperature applications

Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Physical Chemistry:801.4 ; Mathematics:921 ; Classical Physics; Quantum Theory; Relativity:931 ; Atomic and Molecular Physics:931.3 ; Quantum Theory; Quantum Mechanics:931.4

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.Baoji Univ Arts & Sci, Coll Phys & Optoelect Technol, Nonlinear Res Inst, Baoji 721016, Peoples R China
4.Southern Univ Sci & Technol, Ctr Computat Sci & Engn, Shenzhen 518055, Peoples R China
5.Chongqing Univ, Ctr Quantum Mat & Devices, Chongqing 400044, Peoples R China

Zou, Runling,Zhan, Fangyang,Zheng, Baobing,et al. Intrinsic quantum anomalous Hall phase induced by proximity in the van der Waals heterostructure germanene/Cr2Ge2Te6[J]. PHYSICAL REVIEW B,2020,101(16).

Zou, Runling,Zhan, Fangyang,Zheng, Baobing,Wu, Xiaozhi,Fan, Jing,&Wang, Rui.(2020).Intrinsic quantum anomalous Hall phase induced by proximity in the van der Waals heterostructure germanene/Cr2Ge2Te6.PHYSICAL REVIEW B,101(16).

Zou, Runling,et al."Intrinsic quantum anomalous Hall phase induced by proximity in the van der Waals heterostructure germanene/Cr2Ge2Te6".PHYSICAL REVIEW B 101.16(2020).