Current Driven Magnetization Reversal in Orbital Chern Insulators

Abstract

Graphene multilayers with flat moiré minibands can exhibit the quantized anomalous Hall effect due to the combined influence of spontaneous valley polarization and topologically non-trival valley-projected bands. The sign of the Hall effect in these Chern insulators can be reversed either by applying an external magnetic field, or by driving a transport current through the system. We propose a current-driven mechanism whereby reversal occurs along lines in the (current $I$, magnetic-field $B$) control parameter space with slope $dI/dB=(e/h)M{A}_M(1-{\gamma }^2)/\gamma$, where $M$ is the magnetization, $A_M$ is the moiré unit cell area, and $\gamma <1$ is the ratio of the chemical potential difference between valleys along a domain wall to the electrical bias $eV$.

arXiv comment4 + epsilon pages

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Cited by in corpus (15)

• Imaging Chern mosaic and Berry-curvature magnetism in magic-angle graphene
• Phonons in magic-angle twisted bilayer graphene
• Domain wall competition in the Chern insulating regime of twisted bilayer graphene
• Current-induced reversal of anomalous Hall conductance in twisted bilayer graphene
• Magnetic Josephson Junctions and Superconducting Diodes in Magic Angle Twisted Bilayer Graphene
• 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 Switching of Valley Polarization in Twisted Bilayer Graphene
• Lattice distortions, moiré phonons, and relaxed electronic band structures in magic-angle twisted bilayer graphene
• Intrinsic torque on the orbital angular momentum in an electric field
• Quarter-Metal Phases in Multilayer Graphene: Ising-XY and Annular Lifshitz Transitions
• Magic momenta and three dimensional Landau levels from a three dimensional graphite moiré superlattice
• Effects of Boundary on Orbital Magnetization for a Bilayer System with Different Chern Numbers
• Unconventional Metallic Magnetism: Non-analyticity and Sign-changing Behavior of Orbital Magnetization in ABC Trilayer Graphene
• Current-induced re-entrant superconductivity and extreme nonreciprocal superconducting diode effect in valley-polarized systems