Quantum anomalous Hall effect from inverted charge transfer gap

Abstract

A general mechanism is presented by which topological physics arises in strongly correlated systems without flat bands. Starting from a charge transfer insulator, topology emerges when the charge transfer energy between the cation and anion is reduced to invert the lower Hubbard band and the spin-degenerate charge transfer band. A universal low-energy theory is developed for the inversion of charge transfer gap in a quantum antiferromagnet. The inverted state is found to be a quantum anomalous Hall (QAH) insulator with non-coplanar magnetism. Interactions play two essential roles in this mechanism: producing the insulating gap and quasiparticle bands prior to the band inversion, and causing the change of magnetic order necessary for the QAH effect after inversion. Our theory explains the electric field induced transition from correlated insulator to QAH state in AB-stacked TMD bilayer MoTe${}_2$/WSe${}_2$.

References in corpus (10)

• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Topological Insulators with Inversion Symmetry
• Quantum Spin Hall Effect and Topological Field Effect Transistor in Two-Dimensional Transition Metal Dichalcogenides
• Quantum Spin Hall Effect in Inverted Type II Semiconductors
• Topological Insulators and Nematic Phases from Spontaneous Symmetry Breaking in 2D Fermi Systems with a Quadratic Band Crossing
• Ground state oxygen holes and the metal-insulator transition in the negative charge transfer rare-earth nickelates
• Flux insertion, entanglement, and quantized responses
• Multifaceted moiré superlattice physics in twisted WSe${}_2$ bilayers
• Theory of tunable flux lattices in the homobilayer moiré of twisted and uniformly strained transition metal dichalcogenides
• Spin-textured Chern bands in AB-stacked transition metal dichalcogenide bilayers

Cited by in corpus (33)

• Colloquium: Quantum anomalous Hall effect
• Mapping twist-tuned multiband topology in bilayer WSe${}_2$
• Topological Phases in AB-Stacked MoTe${}_2$/WSe${}_2$: ${\mathbb{Z}}_2$ Topological Insulators, Chern Insulators, and Topological Charge Density Waves
• Interaction-driven topological phase diagram of twisted bilayer MoTe${}_2$
• Chiral Kondo Lattice in Doped MoTe${}_2$/WSe${}_2$ Bilayers
• Nematic excitonic insulator in transition metal dichalcogenide moiré heterobilayers
• Excitonic Chern insulator and kinetic ferromagnetism in MoTe${}_2$/WSe${}_2$ moiré bilayer
• Electrically tuned topology and magnetism in twisted bilayer MoTe${}_2$ at ${\nu }_h=1$
• Engineering second-order topological insulators via coupling two first-order topological insulators
• Quantum anomalous Hall effect and electric-field-induced topological phase transition in AB-stacked MoTe${}_2$/WSe${}_2$ moiré heterobilayers
• Multiferroicity and Topology in Twisted Transition Metal Dichalcogenides
• Magic-angle Twisted Bilayer Systems with Quadratic-Band-Touching: Exactly Flat Bands with High-Chern Number
• Kondo effect and its destruction in hetero-bilayer transition metal dichalcogenides
• Pseudogap metal and magnetization plateau from doping moiré Mott insulator
• Topological Kondo semimetal and insulator in AB-stacked heterobilayer transition metal dichalcogenides
• Majorana zero modes in twisted transition metal dichalcogenides homobilayers
• Interlayer Coupling Induced Topological Phase Transition to Higher Order
• Spin-polarons and ferromagnetism in doped dilute Wigner-Mott insulators
• Intrinsically-multilayer moiré heterostructures
• Berry curvature, spin Hall effect and nonlinear optical response in moiré transition metal dichalcogenide heterobilayers
• Symmetric Wannier states and tight-binding model for quantum spin Hall bands in AB-stacked MoTe${}_2$/WSe${}_2$
• Optical readout of the chemical potential of two-dimensional electrons
• Correlated Topological Mixed-Valence Insulators in Moiré Hetero-Bilayers
• Topological $p_x+i{p}_y$ inter-valley coherent state in Moiré MoTe${}_2$/WSe${}_2$ heterobilayers
• Ferromagnetic Negative Charge-Transfer Insulator: from Theoretical Proposal to Material Realization
• Emergent chiral symmetry in non-bipartite kagome and pyrochlore lattices with spin-orbit coupling
• Twistronics and moiré superlattice physics in 2D transition metal dichalcogenides
• Topological Kondo semimetals emulated in hetero-bilayer transition metal dichalcogenides
• Topological charge excitations and Green's function zeros in paramagnetic Mott insulators
• Interplay between topology and electron-electron interactions in the moiré MoTe${}_2$/WSe${}_2$ heterobilayer
• Chern-Selective multi-valley Flat Bands in Twisted Mono-Bilayer and Mono-Trilayer MoTe${}_2$
• Doping-induced Quantum Anomalous Hall Crystals and Topological Domain Walls
• SU(4) Kondo Lattice in Semiconductor Moiré Materials