Quantum anomalous Hall effect in stable 1T-YN${}_2$ monolayer with a large nontrivial band gap and high Chern number

Abstract

The quantum anomalous Hall (QAH) effect is a topologically nontrivial phase, characterized by a non-zero Chern number defined in the bulk and chiral edge states in the boundary. Using first-principles calculations, we demonstrate the presence of the QAH effect in 1T-YN${}_2$ monolayer, which was recently predicted to be a Dirac half metal without spin-orbit coupling (SOC). We show that the inclusion of SOC opens up a large nontrivial band gap of nearly $0.1$ eV in the electronic band structure. This results in the nontrivial bulk topology which is confirmed by the calculation of Berry curvature, anomalous Hall conductance and the presence of chiral edge states. Remarkably, a high Chern number $C=3$ is found, and there are three corresponding gapless chiral edge states emerging inside the bulk gap. Our results open a new avenue in searching for QAH insulators with high temperature and high Chern numbers, which can have nontrivial practical applications.

References in corpus (50)

• Topological Insulators
• Atomically thin MoS2: A new direct-gap semiconductor
• Topological insulators and superconductors
• Boron nitride substrates for high-quality graphene electronics
• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• WannierTools: An open-source software package for novel topological materials
• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• Experimental realisation of the topological Haldane model
• Quantum Spin Hall Effect and Topological Field Effect Transistor in Two-Dimensional Transition Metal Dichalcogenides
• Valley-Polarized Metals and Quantum Anomalous Hall Effect in Silicene
• An equivalent expression of Z2 Topological Invariant for band insulators using Non-Abelian Berry's connection
• Topological quantization of the spin Hall effect in two-dimensional paramagnetic semiconductors
• Observation of the Quantum Spin Hall Effect up to 100 Kelvin in a Monolayer Crystal
• Realization of Two-Dimensional Spin-orbit Coupling for Bose-Einstein Condensates
• Quantum Anomalous Hall Effect in Hg${}_{1-y}$Mn${}_y$Te Quantum Wells
• Electronic structures and theoretical modelling of two-dimensional group-VIB transition metal dichalcogenides
• Quantum Anomalous Hall Effect in Graphene from Rashba and Exchange Effects
• Computing topological invariants without inversion symmetry
• Chiral Topological Superconductor From the Quantum Hall State
• Topological Phases in Two-Dimensional Materials: A Brief Review
• Quantum anomalous Hall effect and related topological electronic states
• Chiral Majorana edge state in a quantum anomalous Hall insulator-superconductor structure
• Z2Pack: Numerical Implementation of Hybrid Wannier Centers for Identifying Topological Materials
• Quantum Anomalous Hall Effect in 2D Organic Topological Insulators
• Electrically tunable quantum anomalous Hall effect in 5d transition-metal adatoms on graphene
• Prediction of Near-Room-Temperature Quantum Anomalous Hall Effect on Honeycomb Materials
• Quantized Anomalous Hall Effect in Two-Dimensional Ferromagnets - Quantum Hall Effect from Metal -
• Realization of 2D Spin-orbit Interaction and Exotic Topological Orders in Cold Atoms
• On the quantum spin Hall gap of monolayer 1T'-WTe2
• Orbital analogue of quantum anomalous Hall effect in $p$-band systems
• Quantum Spin Hall Effect and Topological Phase Transition in Two-Dimensional Square Transition Metal Dichalcogenides
• Low-Energy Effective Hamiltonian for Giant-Gap Quantum Spin Hall Insulators in Honeycomb X-Hydride/Halide (X=N-Bi) Monolayers
• Correlation-driven topological phase transition from in-plane magnetized quantum anomalous Hall to Mott insulating phase in monolayer transition metal trichlorides
• Quantum Anomalous Hall Effect with Cold Atoms Trapped in a Square Lattice
• Chern insulators from heavy atoms on magnetic substrates
• Dirac spin gapless semiconductors: Ideal platforms for massless and dissipationless spintronics and new (quantum) anomalous spin Hall effects
• sd2 Graphene: Kagome Band in Hexagonal lattice
• Emergent topological and half semimetallic Dirac Fermions at oxide interfaces
• Functionalized Bismuth Films: Giant Gap Quantum Spin Hall and Valley-Polarized Quantum Anomalous Hall States
• Topological Spin Texture in a Quantum Anomalous Hall Insulator
• van der Waals Heterostructures of Germanene, Stanene and Silicene with Hexagonal Boron Nitride and Their Topological Domain Walls
• Two-Dimensional Transition Metal Dichalcogenides with a Hexagonal Lattice: Room Temperature Quantum Spin Hall Insulators
• Chern Half Metals: A New Class of Topological Materials to Realize the Quantum Anomalous Hall Effect
• Valley-polarized quantum anomalous Hall phases and tunable topological phase transitions in half-hydrogenated Bi honeycomb monolayers
• Topological phases of Bi(111) bilayer in an external exchange field
• Topological Phases in Triangular Lattices of Ru Adsorbed on Graphene: ab-initio calculations
• Ferromagnetism and quantum anomalous Hall effect in one-side-saturated buckled honeycomb lattices
• Engineering quantum anomalous Hall phases with orbital and spin degrees of freedom
• New Group V Elemental Bilayers: A Tunable Structure Model with 4,6,8-atom Rings
• Gallium Bismuth Halides GaBi-X2 (X= I, Br, Cl) Monolayers with Distorted Hexagonal Framework: Novel Room-Temperature Quantum Spin Hall Insulators

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