Voltage-Controlled Magnetic Reversal in Orbital Chern Insulators

Abstract

Chern insulator ferromagnets are characterized by a quantized anomalous Hall effect, and have so far been identified experimentally in magnetically-doped topological insulator (MTI) thin films and in bilayer graphene moir{é} superlattices. We classify Chern insulator ferromagnets as either spin or orbital, depending on whether the orbital magnetization results from spontaneous spin-polarization combined with spin-orbit interactions, as in the MTI case, or directly from spontaneous orbital currents, as in the moir{é} superlattice case. We argue that in a given magnetic state, characterized for example by the sign of the anomalous Hall effect, the magnetization of an orbital Chern insulator will often have opposite signs for weak $n$ and weak $p$ electrostatic or chemical doping. This property enables pure electrical switching of a magnetic state in the presence of a fixed magnetic field.

11 pages, 6 figures

References in corpus (11)

• Intrinsic and Rashba Spin-orbit Interactions in Graphene Sheets
• Spin-orbit gap of graphene: First-principles calculations
• High-precision realization of robust quantum anomalous Hall state in a hard ferromagnetic topological insulator
• 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
• Orbital magnetization in periodic insulators
• Origin of band gaps in graphene on hexagonal boron nitride
• Precise quantization of anomalous Hall effect near zero magnetic field
• Electronic properties of graphene hexagonal boron nitride moiré superlattice
• Zero Energy Modes and Gate-Tunable Gap in Graphene on hexagonal Boron Nitride
• Moiré band model and band gaps of graphene on hexagonal boron nitride

Cited by in corpus (51)

• Integer and fractional Chern insulators in twisted bilayer MoTe2
• Colloquium: Quantum anomalous Hall effect
• Imaging orbital ferromagnetism in a moiré Chern insulator
• Competing zero-field Chern insulators in Superconducting Twisted Bilayer Graphene
• Orbital Hall effect as an alternative to valley Hall effect in gapped graphene
• Spin-orbit driven ferromagnetism at half moiré filling in magic-angle twisted bilayer graphene
• Orbital Multiferroicity in Pentalayer Rhombohedral Graphene
• Theory of zero-field superconducting diode effect in twisted trilayer graphene
• Imaging Chern mosaic and Berry-curvature magnetism in magic-angle graphene
• Tunable quantum anomalous Hall octet driven by orbital magnetism in bilayer graphene
• Moiré Commensurability and the Quantum Anomalous Hall Effect in Twisted Bilayer Graphene on Hexagonal Boron Nitride
• Superconductivity and quantized anomalous Hall in rhombohedral graphene
• Anomalous Hall effect at half filling in twisted bilayer graphene
• Tunable moiré materials for probing Berry physics and topology
• Evidence of orbital ferromagnetism in twisted bilayer graphene aligned to hexagonal boron nitride
• Detecting symmetry breaking in magic angle graphene using scanning tunneling microscopy
• Orbital angular momentum of Bloch electrons: equilibrium formulation, magneto-electric phenomena, and the orbital Hall effect
• Electrical control of spin and valley in spin-orbit coupled graphene multilayers
• Tunable ferromagnetism at non-integer filling of a moiré superlattice
• Topological electronic crystals in twisted bilayer-trilayer graphene
• Current-induced reversal of anomalous Hall conductance in twisted bilayer graphene
• Magnetic Josephson Junctions and Superconducting Diodes in Magic Angle Twisted Bilayer Graphene
• Lattice Collective Modes from a Continuum Model of Magic-Angle Twisted Bilayer Graphene
• Local spectroscopy of a gate-switchable moiré quantum anomalous Hall insulator
• Alternating twisted mutilayer graphene: generic partition rules, double flat bands, and orbital magnetoelectric effect
• Helical trilayer graphene: a moiré platform for strongly-interacting topological bands
• Current Driven Magnetization Reversal in Orbital Chern Insulators
• Spin-orbit coupling-enhanced valley ordering of malleable bands in twisted bilayer graphene on WSe2
• Control of Giant Topological Magnetic Moment and Valley Splitting in Trilayer Graphene
• Quantum plasmonic non-reciprocity in parity-violating magnets
• Lattice distortions, moiré phonons, and relaxed electronic band structures in magic-angle twisted bilayer graphene
• Orbital Chern Insulator at $\nu =-2$ in Twisted MoTe${}_2$
• Phase diagram and orbital Chern insulator in twisted double bilayer graphene
• Perpendicular electric field drives Chern transitions and layer polarization changes in Hofstadter bands
• High-Chern number phase in the topological insulator multilayer structures
• Quantum Phases of Kagome Electron System with Half-Filled Flat Bands
• Weak Coupling Theory of Magic-Angle Twisted Bilayer Graphene
• Magic momenta and three dimensional Landau levels from a three dimensional graphite moiré superlattice
• Textured Exciton Insulators
• Nonreciprocal phonons in PT-symmetric antiferromagnet
• Unconventional Metallic Magnetism: Non-analyticity and Sign-changing Behavior of Orbital Magnetization in ABC Trilayer Graphene
• Enhancement of temperature of quantum anomalous Hall effect in two-dimensional germanene/magnetic semiconductor heterostructures
• Emergence of intrinsically isolated flat bands and their topology in fully relaxed twisted multi-layer graphene
• Orbital Magnetization of Correlated States in Twisted Bilayer Transition Metal Dichalcogenides
• Magnetic Hofstadter cascade in a twisted semiconductor homobilayer
• Orbital Hall Conductivity in a Graphene/Haldane and Haldane/Haldane Bilayers
• Superpolarized Electron-Hole Liquid and Multiferroicity in Multilayer Graphene
• Spin-orbital magnetism in moiré Wigner molecules
• Low-frequency and Moiré Floquet engineering: a review
• Family of High-Chern-Number Orbital Magnets in Twisted Rhombohedral Graphene
• Dirac node pinning from Dzyaloshinskii-Moriya interactions in a Kagome spin liquid