Intrinsic quantum anomalous Hall phase induced by proximity in germanene/Cr${}_2$Ge${}_2$Te${}_6$ van der Waals heterostructure

Abstract

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/Cr${}_2$Ge${}_2$Te${}_6$. 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 Cr${}_2$Ge${}_2$Te${}_6$ layers, inducing the nontrivial band gaps in a wide range from 29 meV to 72 meV. The chiral edge states inside the band gap, leading to Hall conductance quantized to $-e^2/h$, are clearly visible. This findings provide an ideal candidate to detect the quantum anomalous Hall states and realize further applications to nontrivial quantum transport at a high temperature.

arXiv comment6 pages, 4 figures

References in corpus (36)

• Layer-dependent Ferromagnetism in a van der Waals Crystal down to the Monolayer Limit
• Discovery of intrinsic ferromagnetism in 2D van der Waals crystals
• Wannier90: A Tool for Obtaining Maximally-Localised Wannier Functions
• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Two and one-dimensional honeycomb structures of silicon and germanium
• WannierTools: An open-source software package for novel topological materials
• Quantum Spin Hall Effect in Silicene
• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• Magnetic-field-induced quantized anomalous Hall effect in intrinsic magnetic topological insulator MnBi${}_2$Te${}_4$
• Intrinsic magnetic topological insulators in van der Waals layered MnBi${}_2$Te${}_4$-family materials
• An equivalent expression of Z2 Topological Invariant for band insulators using Non-Abelian Berry's connection
• Robust axion insulator and Chern insulator phases in a two-dimensional antiferromagnetic topological insulator
• Quantum Anomalous Hall Effect in Graphene from Rashba and Exchange Effects
• Trajectory of Anomalous Hall Effect toward the Quantized State in a Ferromagnetic Topological Insulator
• Scale-Invariant Dissipationless Chiral Transport in Magnetic Topological Insulators beyond the Two-Dimensional Limit
• Z2Pack: Numerical Implementation of Hybrid Wannier Centers for Identifying Topological Materials
• Quantum Anomalous Hall Effect in 2D Organic Topological Insulators
• Gapless surface Dirac cone in antiferromagnetic topological insulator MnBi${}_2$Te${}_4$
• Precise quantization of anomalous Hall effect near zero magnetic field
• Dirac surface states in intrinsic magnetic topological insulators EuSn2As2 and MnBi2nTe3n+1
• Intrinsic Quantum Anomalous Hall Effect in the Kagome Lattice Cs2LiMn3F12
• A van der Waals antiferromagnetic topological insulator with weak interlayer magnetic coupling
• Natural van der Waals heterostructural single crystals with both magnetic and topological properties
• Large Chern Number Quantum Anomalous Hall Effect In Thin-film Topological Crystalline Insulators
• Strong magnetization and Chern insulators in compressed graphene/CrI${}_3$ van der Waals heterostructures
• Proximity exchange effects in MoSe${}_2$ and WSe${}_2$ heterostructures with CrI${}_3$: twist angle, layer, and gate dependence
• Quantum anomalous Hall effect with tunable Chern number in magnetic topological insulator film
• Two-dimensional Weyl Half Semimetal and Tunable Quantum Anomalous Hall Effect in Monolayer PtCl${}_3$
• Rational design principles of quantum anomalous Hall effect from superlattice-like magnetic topological insulators
• Chern insulators from heavy atoms on magnetic substrates
• Large Anomalous Hall Effect in Topological Insulators with Proximitized Ferromagnetic Insulators
• Magnetize Topological Surface States of Bi2Se3 with a CrI3 Monolayer
• Magnetic and transport properties in magnetic topological insulators MnBi2Te4(Bi2Te3)n (n=1,2)
• Record-High Proximity-Induced Anomalous Hall Effect in (Bi${}_x$Sb${}_{1-x}$)2Te${}_3$ Thin Film Grown on CrGeTe${}_3$ Substrate
• Quantum Anomalous Hall State in Ferromagnetic SrRuO${}_3$ (111) Bilayers
• Large Band Gap Quantum Anomalous Hall Phase in Hexagonal Organometallic Frameworks

Cited by in corpus (11)

• Colloquium: Quantum anomalous Hall effect
• Kagome quantum anomalous Hall effect with high Chern number and large band gap
• 2D Magnetic Semiconductors via Substitutional Doping of Transition Metal Dichalcogenides
• Quantum anomalous Hall effect in two-dimensional magnetic insulator heterojunctions
• Spin-valley polarized edge states and quantum anomalous Hall states controlled by side potential in 2D honeycomb lattices
• Elucidating proximity magnetism through polarized neutron reflectometry and machine learning
• Multimechanism quantum anomalous Hall and Chern number tunable states in germanene (silicene, stanene)/$M$Bi${}_2$Te${}_4$ heterostructures
• Universally optimizable strategy for magnetic gaps towards high-temperature quantum anomalous Hall states via magnetic-insulator/topological-insulator building-blocks
• Enhancement of temperature of quantum anomalous Hall effect in two-dimensional germanene/magnetic semiconductor heterostructures
• Controlling topology through targeted composite symmetry manipulation in magnetic systems
• Valley-Polarized Quantum Anomalous Hall Phase in Bilayer Graphene with Layer-Dependent Proximity Effects