Strong magnetization and Chern insulators in compressed graphene/CrI${}_3$ van der Waals heterostructures

Abstract

Graphene-based heterostructures are a promising material system for designing the topologically nontrivial Chern insulating devices. Recently, a two-dimensional (2D) monolayer ferromagnetic insulator CrI${}_3$ was successfully synthesized in experiments [Huang et al., Nature 546, 270 (2017)]. Here, these two interesting materials are proposed to build a heterostructure (Gr/CrI${}_3$). Our first-principles calculations show that the system forms a van der Waals (vdW) heterostructure, relatively facilely fabricated in experiments. A Chern insulating state is acquired in the Gr/CrI${}_3$ heterostructure if the vdW gap is compressed to certain extents by applying an external pressure. Amazingly, very strong magnetization (about 150 meV) is found in graphene, induced by the substrate CrI${}_3$, despite the vdW interactions between them. A low-energy effective model is employed to understand the mechanism. The work functions, contact types, and band alignments of the Gr/CrI${}_3$ heterostructure system are also studied. Our work demonstrates that the Gr/CrI${}_3$ heterostructure is a promising system to observe the quantum anomalous Hall effect at high temperatures (up to 45 K) in experiments.

9 pages, 5 figures

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Cited by in corpus (47)

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• Interplay between interlayer exchange and stacking in CrI${}_3$ bilayers
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• Proximity exchange effects in MoSe${}_2$ and WSe${}_2$ heterostructures with CrI${}_3$: twist angle, layer, and gate dependence
• Quantum Anomalous Hall Effects in Graphene from Proximity-Induced Uniform and Staggered Spin-Orbit and Exchange Coupling
• Magnetic proximity in a van der Waals heterostructure of magnetic insulator and graphene
• Distinct spin-lattice and spin-phonon interactions in monolayer magnetic CrI${}_3$
• Magnetize Topological Surface States of Bi2Se3 with a CrI3 Monolayer
• Magnetization textures in twisted bilayer 2D CrX${}_3$ (X=Br, I)
• Real space mapping of topological invariants using artificial neural networks
• Remarkably enhanced Curie temperature in monolayer CrI3 by hydrogen and oxygen adsorption: A first-principles calculations
• Kagome quantum anomalous Hall effect with high Chern number and large band gap
• Twist- and gate-tunable proximity spin-orbit coupling, spin relaxation anisotropy, and charge-to-spin conversion in heterostructures of graphene and transition-metal dichalcogenides
• Quantum Anomalous Hall Effect in Magnetic Doped Topological Insulators and Ferromagnetic Spin-Gapless Semiconductors -- A Perspective Review
• Intrinsic quantum anomalous Hall phase induced by proximity in germanene/Cr${}_2$Ge${}_2$Te${}_6$ van der Waals heterostructure
• Realization of Semiconducting Layered Multiferroic Heterojunctions via Asymmetrical Magnetoelectric Coupling
• Gate-tunable proximity effects in graphene on layered magnetic insulators
• Role of quantum confinement and interlayer coupling in CrI${}_3$-graphene magnetic tunnel junctions
• Magnetic Proximity Effect in a van der Waals Moiré Superlattice
• Engineering Proximity Exchange by Twisting: Reversal of Ferromagnetic and Emergence of Antiferromagnetic Dirac Bands in Graphene/Cr${}_2$Ge${}_2$Te${}_6$
• Proximity effects in graphene on monolayers of transition-metal phosphorus trichalcogenides MPX${}_3$
• Spin-Valley Polarized Quantum Anomalous Hall Effect and a Valley-Controlled Half Metal in Bilayer Graphene
• Large Band Gap Quantum Anomalous Hall Phase in Hexagonal Organometallic Frameworks
• Proximity spin-orbit and exchange coupling in ABA and ABC trilayer graphene van der Waals heterostructures
• Single and bilayer graphene on the topological insulator Bi${}_2$Se${}_3$: Electronic and spin-orbit properties from first principles
• Magnetic Anisotropy in Two-dimensional van der Waals Magnetic Materials and Their Heterostructures: Importance, Mechanisms, and Opportunities
• Spontaneous Valley Spirals in Magnetically Encapsulated Twisted Bilayer Graphene
• The first- and second-order magneto-optical effects and intrinsically anomalous transport in 2D van der Waals layered magnets CrXY (X = S, Se, Te; Y = Cl, Br, I)
• Ferromagnetic nodal-line metal in monolayer {\em h}-InC
• Quantum Anomalous Hall Effect by Coupling Heavy Atomic Layers with CrI${}_3$
• Strong magnetic proximity effect in Van der Waals heterostructures driven by direct hybridization
• Spin-dependent Schottky barriers and vacancy-induced spin-selective Ohmic contacts in magnetic vdW heterostructures
• Exchange splitting and exchange-induced non-reciprocal photonic behavior of graphene in CrI3-graphene vdW heterostructures
• Multimechanism quantum anomalous Hall and Chern number tunable states in germanene (silicene, stanene)/$M$Bi${}_2$Te${}_4$ heterostructures
• Giant gate-tunable renormalization of spin-correlated flat-band states and bandgap in a 2D magnetic insulator
• Proximity-induced diversified magnetic states and electrically-controllable spin polarization in bilayer graphene: Towards layered spintronics
• Magnetic States of Graphene Proximitized Kitaev Materials
• Large Rashba Spin-Orbit Coupling and High-Temperature Quantum Anomalous Hall Effect in Re-Intercalated Graphene/CrI${}_3$ Heterostructure
• Moire-enabled topological superconductivity in twisted bilayer graphene
• Universally optimizable strategy for magnetic gaps towards high-temperature quantum anomalous Hall states via magnetic-insulator/topological-insulator building-blocks
• Topological Interlayer Superconductivity in a van der Waals Heterostructure
• Optimizing Hubbard U parameters for Enhanced Description of Electronic and Magnetic Properties in CrI${}_3$ Monolayers and Bilayers
• Gate control of 2D magnetism in tri- and four-layers $\mathrm{Cr}{\mathrm{I}}_3$/graphene heterostructures
• Exploring the interfacial coupling between graphene and the antiferromagnetic insulator MnPSe${}_3$
• Topological phases of electrons induced by electron-magnon interactions
• Current-induced CrI3 surface spin-flop transition probed by proximity magnetoresistance in Pt