Antiferromagnetic Chern insulator with large charge gap in heavy transition-metal compounds

Abstract

Despite the discovery of multiple intrinsic magnetic topological insulators in recent years the observation of Chern insulators is still restricted to very low temperatures due to the negligible charge gaps. Here, we uncover the potential of heavy transition-metal compounds for realizing a collinear antiferromagnetic Chern insulator (AFCI) with a charge gap as large as 300 meV. Our analysis relies on the Kane-Mele-Kondo model with a ferromagnetic Hund coupling $J_{\mathrm{H}}$ between the spins of itinerant electrons and the localized spins of size $S$. We show that a spin-orbit coupling ${\lambda }_{\mathrm{SO}}\gtrsim 0.03t$, where $t$ is the nearest-neighbor hopping element, is already large enough to stabilize an AFCI provided the alternating sublattice potential $\delta$ is in the range $\delta \approx S{J}_{\mathrm{H}}$. We establish a remarkable increase in the charge gap upon increasing ${\lambda }_{\mathrm{SO}}$ in the AFCI phase. Using our results we explain the collinear AFCI recently found in monolayers of CrO and MoO with charge gaps of 1 and $50$ meV, respectively. In addition, we propose bilayers of heavy transition-metal oxides of perovskite structure as candidates to realize a room-temperature AFCI if grown along the $[111]$ direction and subjected to a perpendicular electric field.

12 pages, 6 figures

References in corpus (53)

• Quantum Spin Hall Effect in Graphene
• $Z_2$ Topological Order and the Quantum Spin Hall Effect
• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Antiferromagnetic spintronics
• Antiferromagnetic spintronics
• Magnetic-field-induced quantized anomalous Hall effect in intrinsic magnetic topological insulator MnBi${}_2$Te${}_4$
• Intrinsic quantized anomalous Hall effect in a moiré heterostructure
• Low-energy effective Hamiltonian involving spin-orbit coupling in Silicene and Two-Dimensional Germanium and Tin
• Topological Insulator and Helical Zero Mode in Silicene under Inhomogeneous Electric Field
• Spin waves and electronic interactions in La2CuO4
• Quantum anomalous Hall effect from intertwined moiré bands
• Phase Separation in Electronic Models for Manganites
• Colloquium: Quantum anomalous Hall effect
• Interface engineering of quantum Hall effects in digital transition metal oxide heterostructures
• Single particle Green's functions and interacting topological insulators
• Magnetic modulation doping in topological insulators toward higher-temperature quantum anomalous Hall effect
• Time-reversal-symmetry-broken quantum spin Hall effect
• Cluster Dynamical Mean Field Theory of the Mott Transition
• Orbital effects in solids: basics, recent progress and opportunities
• Gapless Dirac surface states in the antiferromagnetic topological insulator MnBi2Te4
• Mott Physics and Topological Phase Transition in Correlated Dirac Fermions
• Metal-to-Insulator Switching in Quantum Anomalous Hall States
• Surface metal-insulator transition in the Hubbard model
• Antiferromagnetic Order of Strongly Interacting Fermions in a Trap: Real-Space Dynamical Mean-Field Analysis
• Electronic Hamiltonian for Transition Metal Oxide Compounds
• Quantum Spin Hall Insulators with Interactions and Lattice Anisotropy
• First order character and observable signatures of topological quantum phase transitions
• Quantum Anomalous Hall Effect in Antiferromagnetism
• Topological phase transitions in the repulsively interacting Haldane-Hubbard model
• Characterization of a topological Mott insulator in one dimension
• Antiferromagnetism and the gap of a Mott insulator: Results from analytic continuation of the self-energy
• Topological Hamiltonian as an Exact Tool for Topological Invariants
• Fluctuation driven topological Hund insulators
• Room temperature two-dimensional antiferromagnetic Weyl semimetal CrO with giant spin-splitting and spin-momentum locked transport
• Dynamical Mean Field Study of the Two-Dimensional Disordered Hubbard Model
• Antiferromagnetic Chern insulators in non-centrosymmetric systems
• Topological magnetic excitations
• Quantum cluster approach to the spinful Haldane-Hubbard model
• Topological invariants for interacting topological insulators: II. Breakdown of the Green's function formalism
• Interacting Hofstadter Interface
• Statistical Analysis of the Chern Number in the Interacting Haldane-Hubbard Model
• Intrinsic Magnetic Topological Materials
• Artificial $SU(3)$ Spin-Orbit Coupling and Exotic Mott Insulators
• Topological invariants for interacting topological insulators: I. Efficient numerical evaluation scheme and implementations
• Strain-tunable topological quantum phase transition in buckled honeycomb lattices
• Connecting the one-band and three-band Hubbard models of cuprates via spectroscopy and scattering experiments
• Interaction-driven topological phase transitions in fermionic SU($3$) systems
• Lattice symmetry and emergence of antiferromagnetic quantum Hall states
• Antiferromagnetic Chern insulator in centrosymmetric systems
• Double-Exchange Enhanced Magnetic Blue-Shift of Mott Gaps
• Relevance of quantum fluctuations in the Anderson-Kondo model
• Quantum cluster approach to the topological invariants in correlated Chern insulators
• Simplified approach to the magnetic blue shift of Mott gaps

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