Quantum anomalous Hall effect from intertwined moiré bands

Abstract

Electron correlation and topology are two central threads of modern condensed matter physics. Semiconductor moiré materials provide a highly tunable platform for studies of electron correlation. Correlation-driven phenomena, including the Mott insulator, generalized Wigner crystals, stripe phases and continuous Mott transition, have been demonstrated. However, nontrivial band topology has remained elusive. Here we report the observation of a quantum anomalous Hall (QAH) effect in AB-stacked MoTe2/WSe2 moiré heterobilayers. Unlike in the AA-stacked structures, an out-of-plane electric field controls not only the bandwidth but also the band topology by intertwining moiré bands centered at different high-symmetry stacking sites. At half band filling, corresponding to one particle per moiré unit cell, we observe quantized Hall resistance, h/e2 (with h and e denoting the Planck's constant and electron charge, respectively), and vanishing longitudinal resistance at zero magnetic field. The electric-field-induced topological phase transition from a Mott insulator to a QAH insulator precedes an insulator-to-metal transition; contrary to most known topological phase transitions, it is not accompanied by a bulk charge gap closure. Our study paves the path for discovery of a wealth of emergent phenomena arising from the combined influence of strong correlation and topology in semiconductor moiré materials.

References in corpus (11)

• Topological Mott Insulators
• Scale-Invariant Dissipationless Chiral Transport in Magnetic Topological Insulators beyond the Two-Dimensional Limit
• Moiré heterostructures as a condensed matter quantum simulator
• Magic in twisted transition metal dichalcogenide bilayers
• Continuous Mott transition in semiconductor moiré superlattices
• Quantum Criticality in Twisted Transition Metal Dichalcogenides
• Correlation effects in two-dimensional topological insulators
• Theory of a continuous Mott transition in two dimensions
• First order character and observable signatures of topological quantum phase transitions
• Charge-order-enhanced capacitance in semiconductor moiré superlattices
• Spin-textured Chern bands in AB-stacked transition metal dichalcogenide bilayers

Cited by in corpus (257)

• Signatures of Fractional Quantum Anomalous Hall States in Twisted MoTe2 Bilayer
• Observation of Fractionally Quantized Anomalous Hall Effect
• Integer and fractional Chern insulators in twisted bilayer MoTe2
• Colloquium: Quantum anomalous Hall effect
• Observation of integer and fractional quantum anomalous Hall effects in twisted bilayer MoTe2
• Magic in twisted transition metal dichalcogenide bilayers
• Superconductivity in twisted bilayer WSe${}_2$
• Fractional quantum anomalous Hall states in twisted bilayer MoTe${}_2$ and WSe${}_2$
• Anomalous Hall metal and fractional Chern insulator in twisted transition metal dichalcogenides
• Programming Correlated Magnetic States via Gate Controlled Moiré Geometry
• Orbital Multiferroicity in Pentalayer Rhombohedral Graphene
• Gate-tunable heavy fermions in a moiré Kondo lattice
• A Microscopic Perspective on Moiré Materials
• Composite Fermi Liquid at Zero Magnetic Field in Twisted MoTe${}_2$
• Quantum Anomalous Hall Effect in Antiferromagnetism
• Large Quantum Anomalous Hall Effect in Spin-Orbit Proximitized Rhombohedral Graphene
• Correlated insulator of excitons in WSe2/WS2 moiré superlattices
• Mapping twist-tuned multiband topology in bilayer WSe${}_2$
• Anomalous Hall Crystals in Rhombohedral Multilayer Graphene I: Interaction-Driven Chern Bands and Fractional Quantum Hall States at Zero Magnetic Field
• Valley-Polarized Quantum Anomalous Hall State in Moiré MoTe${}_2$/WSe${}_2$ Heterobilayers
• Kinetic Magnetism in Triangular Moiré Materials
• Polarization-driven band topology evolution in twisted MoTe${}_2$ and WSe${}_2$
• Charge-transfer Contact to a High-Mobility Monolayer Semiconductor
• Superconductivity and quantized anomalous Hall in rhombohedral graphene
• Pressure--enhanced fractional Chern insulators in moiré transition metal dichalcogenides along a magic line
• Maximally Localized Wannier Orbitals, Interaction Models and Fractional Quantum Anomalous Hall Effect in Twisted Bilayer MoTe2
• Topological Phases in AB-Stacked MoTe${}_2$/WSe${}_2$: ${\mathbb{Z}}_2$ Topological Insulators, Chern Insulators, and Topological Charge Density Waves
• Quantum anomalous Hall effect from inverted charge transfer gap
• Spin-Orbit Coupling in Transition Metal Dichalcogenide Heterobilayer Flat Bands
• Non-local interactions in moiré Hubbard systems
• Tunable moiré materials for probing Berry physics and topology
• Quantum Hall phase in graphene engineered by interfacial charge coupling
• Topological Mott Insulator at Quarter Filling in the Interacting Haldane Model
• Interaction-driven topological phase diagram of twisted bilayer MoTe${}_2$
• Nonlinear anomalous Hall effects probe topological phase-transitions in twisted double bilayer graphene
• Monolayer V2MX4: A new family of quantum anomalous Hall insulators
• Quantized anomalous Hall resistivity achieved in molecular beam epitaxy-grown MnBi2Te4 thin films
• Band mixing in the quantum anomalous Hall regime of twisted semiconductor bilayers
• Chiral Kondo Lattice in Doped MoTe${}_2$/WSe${}_2$ Bilayers
• Theory of fractional Chern insulator states in pentalayer graphene moiré superlattice
• Gate-tunable heavy fermion quantum criticality in a moiré Kondo lattice
• Floquet Engineering of Nonequilibrium Valley-Polarized Quantum Anomalous Hall Effect with Tunable Chern Number
• Doping a moiré Mott Insulator: A t-J model study of twisted cuprates
• Topological superconductivity in doped magnetic moiré semiconductors
• Intercell Moiré Exciton Complexes in Electron Lattices
• Stability of Anomalous Hall Crystals in multilayer rhombohedral graphene
• Interplay between topology and correlations in the second moiré band of twisted bilayer MoTe2
• Quantum anomalous Hall crystal at fractional filling of moiré superlattices
• Phase transitions out of quantum Hall states in moiré materials
• Progress and Prospects in Two-Dimensional Magnetism of van der Waals Materials
• Multiple Chern bands in twisted MoTe${}_2$ and possible non-Abelian states
• Itinerant spin polaron and metallic ferromagnetism in semiconductor moiré superlattices
• Exciton Proliferation and Fate of the Topological Mott Insulator in a Twisted Bilayer Graphene Lattice Model
• Ultra-Strong Spin-Orbit Coupling and Topological Moiré Engineering in Twisted ZrS2 Bilayers
• Antiferromagnetic Quantum Anomalous Hall Effect Modulated by Spin Flips and Flops
• Moiré-driven multiferroic order in twisted CrCl${}_3$, CrBr${}_3$ and CrI${}_3$ bilayers
• Tunable spin and valley excitations of correlated insulators in $\Gamma$-valley moiré bands
• High-Temperature Quantum Valley Hall Effect with Quantized Resistance and a Topological Switch
• Sublattice structure and topology in spontaneously crystallized electronic states
• Imaging de Haas-van Alphen quantum oscillations and milli-Tesla pseudomagnetic fields
• Competition of Density Waves and Superconductivity in Twisted Tungsten Diselenide
• Giant proximity exchange and flat Chern band in 2D magnet-semiconductor heterostructures
• Progress and prospects in the quantum anomalous Hall effect
• Moiré Fractional Chern Insulators III: Hartree-Fock Phase Diagram, Magic Angle Regime for Chern Insulator States, the Role of the Moiré Potential and Goldstone Gaps in Rhombohedral Graphene Superlattices
• 1/4 is the new 1/2 when topology is intertwined with Mottness
• Recent Developments in Fractional Chern Insulators
• Intrinsic spin Hall torque in a moire Chern magnet
• Machine learning approach to genome of two-dimensional materials with flat electronic bands
• Quantum Imaging of Magnetic Phase Transitions and Spin Fluctuations in Intrinsic Magnetic Topological Nanoflakes
• Creation of Chiral Interface Channels for Quantized Transport in Magnetic Topological Insulator Multilayer Heterostructures
• Band structure engineering using a moiré polar substrate
• Massive Dirac fermions in moiré superlattices: a route towards topological flat minibands
• General nonlinear Hall current in magnetic insulators beyond the quantum anomalous Hall effect
• Nematic excitonic insulator in transition metal dichalcogenide moiré heterobilayers
• Two-dimensional Kagome Materials: Theoretical Insights, Experimental Realizations, and Electronic Structures
• Topological electronic crystals in twisted bilayer-trilayer graphene
• Striped electronic phases in an incommensurately modulated van der Waals superlattice
• Superconductivity and spin canting in spin-orbit proximitized rhombohedral trilayer graphene
• Gate-tunable antiferromagnetic Chern insulator in twisted bilayer transition metal dichalcogenides
• Controllable chirality and band gap of quantum anomalous Hall insulators
• Superconductivity in twisted transition metal dichalcogenide homobilayers
• Nanoscale electrostatic control in ultra clean van der Waals heterostructures by local anodic oxidation of graphite gates
• Orbital Fulde-Ferrell pairing state in moiré Ising superconductors
• Excitonic Chern insulator and kinetic ferromagnetism in MoTe${}_2$/WSe${}_2$ moiré bilayer
• Helical trilayer graphene: a moiré platform for strongly-interacting topological bands
• Chern Number Tunable Quantum Anomalous Hall Effect in Compensated Antiferromagnets
• Halperin States of Particles and Holes in Ideal Time Reversal Invariant Pairs of Chern Bands and The Fractional Quantum Spin Hall Effect in Moiré MoTe${}_2$
• Electrical Switching of the Edge Current Chirality in Quantum Anomalous Hall Insulators
• Thermodynamic Response and Neutral Excitations in Integer and Fractional Quantum Anomalous Hall States Emerging from Correlated Flat Bands
• Bridging the small and large in twisted transition metal dicalcogenide homobilayers: a tight binding model capturing orbital interference and topology across a wide range of twist angles
• Intrinsic magnetic topological insulators of the MnBi${}_2$Te${}_4$ family
• Gate-tunable topological phases in superlattice modulated bilayer graphene
• Nematic, chiral and topological superconductivity in transition metal dichalcogenides
• Robust Interlayer-Coherent Quantum Hall States in Twisted Bilayer Graphene
• Rules for dissipationless topotronics
• Observation of spin-wave moiré edge and cavity modes in twisted magnetic lattices
• Kagome chiral spin liquid in transition metal dichalcogenide moiré bilayers
• Interactions mediated by atoms, photons, electrons, and excitons
• Fractional quantum anomalous Hall effect in a singular flat band
• Interaction range and temperature dependence of symmetry breaking in strongly correlated two-dimensional moiré transition metal dichalcogenide bilayers
• Singlet, Triplet and Pair Density Wave Superconductivity in the Doped Triangular-Lattice Moiré System
• Quantum anomalous Hall insulator in ionic Rashba lattice of correlated electrons
• Quantum anomalous Hall effect and electric-field-induced topological phase transition in AB-stacked MoTe${}_2$/WSe${}_2$ moiré heterobilayers
• Dirac fermions with plaquette interactions. III. SU(N) phase diagram with Gross-Neveu criticality and first-order phase transition
• Extended quantum anomalous Hall effect in moiré structures: phase transitions and transport
• Engineering the in-plane anomalous Hall effect in Cd${}_3$As${}_2$ thin films
• Superconductivity in twisted WSe${}_2$ from topology-induced quantum fluctuations
• Contrasting twisted bilayer graphene and transition metal dichalcogenides for fractional Chern insulators: an emergent gauge picture
• Strong-coupling phases of trions and excitons in electron-hole bilayers at commensurate densities
• Multiferroicity and Topology in Twisted Transition Metal Dichalcogenides
• Magic-angle Twisted Bilayer Systems with Quadratic-Band-Touching: Exactly Flat Bands with High-Chern Number
• Topological multiferroic order in twisted transition metal dichalcogenide bilayers
• Long-lived Topological Flatband Excitons in Semiconductor Moiré Heterostructures: a Bosonic Kane-Mele Model Platform
• Growth and applications of two-dimensional single crystals
• Electronic transport, metal-insulator transition, and Wigner crystallization in transition metal dichalcogenide monolayers
• Theory of Topological Superconductivity and Antiferromagnetic Correlated Insulators in Twisted Bilayer WSe${}_2$
• Topological Mott insulator in the odd-integer filled Anderson lattice model with Hatsugai-Kohmoto interactions
• Quantum Melting of Generalized Wigner Crystals in Transition Metal Dichalcogenide Moiré Systems
• Twisted-bilayer FeSe and the Fe-based superlattices
• Time-Reversal Invariant Topological Moiré Flatband: A Platform for the Fractional Quantum Spin Hall Effect
• Kondo effect and its destruction in hetero-bilayer transition metal dichalcogenides
• On-Chip Terahertz Spectroscopy for Dual-Gated van der Waals Heterostructures at Cryogenic Temperatures
• Large-Gap Quantum Anomalous Hall Insulators in $A$Ti$X$ Class
• Chiral and nodal superconductors in t-J model with valley contrasting flux on triangular moiré lattice
• Optical control of topological memory based on orbital magnetization
• High temperature, gate-free quantum anomalous Hall effect with an active capping layer
• Polaron spectroscopy of interacting Fermi systems: insights from exact diagonalization
• Interlayer donor-acceptor pair excitons in MoSe2/WSe2 moiré heterobilayer
• Topological Kondo semimetal and insulator in AB-stacked heterobilayer transition metal dichalcogenides
• Possible Sliding Regimes in Twisted Bilayer WTe${}_2$
• Majorana zero modes in twisted transition metal dichalcogenides homobilayers
• Realizing a tunable honeycomb lattice in ABBA-stacked twisted double bilayer WSe${}_2$
• Doping a Wigner-Mott insulator: Exotic charge orders in transition-metal dichalcogenide moiré heterobilayers
• A New Moiré Platform Based on M-Point Twisting
• Engineering robust strain transmission in van der Waals heterostructure devices
• The Layer Hall Effect without External Electric Field
• Interacting phase diagram of twisted bilayer MoTe${}_2$ in magnetic field
• Intrinsically-multilayer moiré heterostructures
• Topological Chiral Superconductivity Mediated by Intervalley Antiferromagnetic Fluctuations in Twisted Bilayer WSe${}_2$
• DPmoire: A tool for constructing accurate machine learning force fields in moiré systems
• Quantum Geometry and the Hidden Scales in Materials
• Berry curvature, spin Hall effect and nonlinear optical response in moiré transition metal dichalcogenide heterobilayers
• Pressure-Driven Moiré Potential Enhancement and Tertiary Gap Opening in Graphene/h-BN Heterostructure
• Dimensional reduction from magnetic field in moiré superlattices
• Symmetric Wannier states and tight-binding model for quantum spin Hall bands in AB-stacked MoTe${}_2$/WSe${}_2$
• Composite helical edges from Abelian fractional topological insulators
• Single-particle spectral function of fractional quantum anomalous Hall states
• Orbitally controlled quantum Hall states in decoupled two-bilayer graphene sheets
• Layer-Dependent Quantum Anomalous Hall Effect in Rhombohedral Graphene
• Optical readout of the chemical potential of two-dimensional electrons
• Time-Domain Signatures of Distinct Correlated Insulators in a Moiré Superlattice
• Observation of Ferromagnetic Phase in the Second Moiré Band of Twisted MoTe2
• Tunable exciton valley-pseudospin orders in moiré Bose-Hubbard model
• Electric-field switchable chirality in rhombohedral graphene Chern insulators stabilized by tungsten diselenide
• Pomeranchuk Effect and Tunable Quantum Phase Transitions in 3L-MoTe2/WSe2
• Correlated Topological Mixed-Valence Insulators in Moiré Hetero-Bilayers
• Quantum anomalous, spin, and valley Hall effects in pentalayer rhombohedral graphene moiré superlattices
• Area-law entanglement from quantum geometry
• Review: Advanced characterization of the spatial variation of moiré heterostructures and moiré excitons
• Inducing topological flat bands in bilayer graphene with electric and magnetic superlattices
• Exciton and light induced ferromagnetism from doping a moiré Mott insulator
• Topological $p_x+i{p}_y$ inter-valley coherent state in Moiré MoTe${}_2$/WSe${}_2$ heterobilayers
• Moiré Band Engineering in Twisted Trilayer WSe2
• Optical Switching of Moiré Chern Ferromagnet
• Anomalous $h/2e$ periodicity and Majorana zero modes in chiral Josephson junctions
• Ultrafast control of moiré pseudo-electromagnetic field in homobilayer semiconductors
• Pressure-tuned many-body phases through $\Gamma$-K valleytronics in moiré bilayer WSe${}_2$
• Interaction induced moiré systems in twisted bilayer optical lattices
• Antiferromagnetic Chern insulator with large charge gap in heavy transition-metal compounds
• Kanamori-Moiré-Hubbard model for transition metal dichalcogenide homobilayers
• Exciton interacting with a moiré lattice: Polarons, strings, and optical probing of spin correlations
• Bad topological semimetals in layered honeycomb compounds
• 5d orbital Induced Room Temperature Quantum Anomalous Hall Effect in TbCl
• Chiral superconductivity from spin polarized Chern band in twisted MoTe${}_2$
• Computing the ${\mathbb{Z}}_2$ Invariant in Two-Dimensional Strongly-Correlated Systems
• Enhancement of temperature of quantum anomalous Hall effect in two-dimensional germanene/magnetic semiconductor heterostructures
• Universal scaling near band-tuned metal-insulator phase transitions
• Edge supercurrent in Josephson junctions based on topological materials
• Twistronics and moiré superlattice physics in 2D transition metal dichalcogenides
• Topological magnons and domain walls in twisted bilayer MoTe${}_2$
• Moiré band theory for M-valley twisted transition metal dichalcogenides
• Artificial moiré engineering for an ideal BHZ model
• A Bound on Topological Gap from Newton's Laws
• Chern-Textured Exciton Insulators with Valley Spiral Order in Moiré Materials
• Parafermions in Moiré Minibands
• Itinerant ferromagnetism in transition metal dichalcogenides moiré superlattices
• Spin-valley magnetism on the triangular moiré lattice with SU(4) breaking interactions
• Chiral edge state coupling theory of transport in quantum anomalous Hall insulators
• The low energy excitation spectrum of magic-angle semimetals
• Considerations for extracting moiré-level strain from dark field intensities in transmission electron microscopy
• Nanoscale ferroelectric programming of van der Waals heterostructures
• Itinerant topological magnons and spin excitons in twisted transition metal dichalcogenides: Mapping electron topology to spin counterpart
• Interaction-induced reentrance of Bose glass and quench dynamics of Bose gases in twisted bilayer and quasicrystal optical lattices
• Angle evolution of the superconducting phase diagram in twisted bilayer WSe2
• Magneto-Induced Topological Phase Transition in Inverted InAs/GaSb Bilayers
• Polarization textures in crystal supercells with topological bands
• Quantum Phases in Twisted Homobilayer Transition Metal Dichalcogenides
• Anomalous Fraunhofer-like patterns in quantum anomalous Hall Josephson junction
• High-Chern-number Quantum anomalous Hall insulators in mixing-stacked MnBi${}_2$Te${}_4$ thin films
• A New Era of Quantum Materials Mastery and Quantum Simulators In and Out of Equilibrium
• Magnetic field induced partially polarized chiral spin liquid in a transition metal dichalcogenide moiré system
• Anisotropic moiré band flattening in twisted bilayers of M-valley MXenes
• Network of chiral one-dimensional channels and localized states emerging in a moiré system
• An ab-initio study on engineering quantum anomalous Hall effect in compensated antiferromagnet MnBi${}_2$Te${}_4$
• Interlayer Dzyaloshinskii-Moriya interactions induced via non-linear phononics in bilayer van der Waals materials
• Orbital Magnetization of Correlated States in Twisted Bilayer Transition Metal Dichalcogenides
• Detecting Hidden Order in Fractional Chern Insulators
• Topological Kondo semimetals emulated in hetero-bilayer transition metal dichalcogenides
• Quantum simulation of honeycomb lattice model by high-order moiré pattern
• Topological charge excitations and Green's function zeros in paramagnetic Mott insulators
• Anyon-trions in atomically thin semiconductor heterostructures
• Non-Abelian Chern band in rhombohedral graphene multilayers
• Spin and Valley Polarized Multiple Fermi Surfaces of α-RuCl${}_3$/Bilayer Graphene Heterostructure
• Incipient quantum spin Hall insulator under strong correlations
• Topological phase transition from periodic edge states in moiré superlattices
• Effects of GaAs buffer layer on quantum anomalous Hall insulator Vy(BixSb1-x)2-yTe3
• Twisted Type-II Rashba Homobilayer: A Platform for Tunable Topological Flat Bands
• Band structure picture for topology in strongly correlated systems with the ghost Gutzwiller ansatz
• Interplay between topology and electron-electron interactions in the moiré MoTe${}_2$/WSe${}_2$ heterobilayer
• Antiferromagnetic topological insulators in heavy-fermion systems
• Valley Gapless Semiconductor: Models and Applications
• Density-dependent spin susceptibility and effective mass in monolayer MoSe2
• Twisted Nodal Superconductors
• Interlayer Coupling-Induced Quantum Phase Transition in Quantum Anomalous Hall Multilayers
• Preservation of Topological Surface States in Millimeter-Scale Transferred Membranes
• False Vacuum Decay in Flat-Band Ferromagnets: Role of Quantum Geometry and Chiral Edge States
• Review of the tight-binding method applicable to the properties of moiré superlattices
• Giant Shift Current in Electrically-Tunable Superlattice Bilayer Graphene
• Effective K valley Hamiltonian for TMD bilayers under pressure and application to twisted bilayers with pressure-induced topological phase transitions
• Fate of chiral order and impurity self-pinning in flat bands with local symmetry
• Impurity-induced Mott ring states and Mott zeros ring states in the Hubbard operator formalism
• Probing Quantum Anomalous Hall States in Twisted Bilayer WSe2 via Attractive Polaron Spectroscopy
• Engineering topological exciton structures in two-dimensional semiconductors by a periodic electrostatic potential
• Kekulé order from diffuse nesting near higher-order Van Hove points
• Spin-orbital magnetism in moiré Wigner molecules
• Spin-orbit torque switching of Néel order in band-inverted antiferromagnetic bilayer MnBi${}_2$Te${}_4$
• Strong Correlations and Superconductivity in the Supermoiré Lattice
• Chern-Selective multi-valley Flat Bands in Twisted Mono-Bilayer and Mono-Trilayer MoTe${}_2$
• Moire Engineering of Cooper-Pair Density Modulation States
• Optical signatures of -1/3 fractional quantum anomalous Hall state in twisted MoTe2
• One-dimensional moiré engineering in zigzag graphene nanoribbons on hBN
• High-Temperature Quantum Anomalous Hall Effect in Buckled Honeycomb Antiferromagnets
• Higher Chern bands in helical homotrilayer transition metal dichalcogenides
• Chern insulators in two and three dimensions: A global perspective
• Selective Kondo screening and strange metallicity by sliding Dirac semimetals
• Spin-orbit-driven quarter semimetals in rhombohedral graphene
• Doping-induced Quantum Anomalous Hall Crystals and Topological Domain Walls
• Manipulating Charge Distribution in Moiré Superlattices by Light
• The antiferromagnetic Chern insulator phase in the Kane-Mele-Hubbard model
• Magnetic and nematic order of Bose-Fermi mixtures in moiré superlattices of 2D semiconductors
• Fate of Berezinskii-Kosterlitz-Thouless Paired Phase in Coupled $XY$ Models
• Effects of GaAs Buffer Layer on Structural, Magnetic, and Transport Properties of Magnetic Topological Insulators Cr${}_y$(Bi${}_x$Sb${}_{1-x}$)${}_{2-y}$Te${}_3$ and V${}_y$(Bi${}_x$Sb${}_{1-x}$)${}_{2-y}$Te${}_3$ Films
• Fractional spin Josephson effect in topological spin superconductors
• Insulating charge transfer ferromagnetism
• Non-Fermi liquid behaviour of CDW instabilities in fractionally-filled moiré flatbands
• Unconventional superconductivity mediated by exciton density wave fluctuations
• Scalable and deterministic construction of moiré superlattice in 2D materials using stressor films