High-temperature large-gap quantum anomalous Hall insulator in ultrathin double perovskite films

Abstract

Motivated by the goal of realizing topological phases in thin films and heterostructures of correlated oxides, we propose here a quantum anomalous Hall insulator (QAHI) in ultrathin films of double perovskites based on mixed 3d-5d or 3d-4d transition metal ions, grown along the [111] direction. Considering the specific case of ultrathin Ba2FeReO6, we present a theoretical analysis of an effective Hamiltonian derived from first-principles. We establish that a strong spin-orbit coupling at Re site, t2g symmetry of the low-energy d-bands, polarity of its [111] orientation of perovskite structure, and mixed 3d-5d chemistry results in room temperature magnetism with a robust QAHI state of Chern number C=1 and a large band-gap. We uncover and highlight a non-relativistic orbital-Rashba-type effect in addition to the spin-orbit coupling, that governs this QAHI state. Our prediction of a large topological band-gap of ~100 meV in electronic structure, and a magnetic transition temperature Tc~300K estimated by Monte Carlo simulations, is expected to stimulate experimental efforts at synthesis of such films and enable possible practical applications of its dissipationless edge currents.

arXiv comment9 pages, 6 figs, submitted to PRB

References in corpus (41)

• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• High-precision realization of robust quantum anomalous Hall state in a hard ferromagnetic topological insulator
• Anomalous Hall effect arising from noncollinear antiferromagnetism
• Quantum Anomalous Hall Effect in Hg${}_{1-y}$Mn${}_y$Te Quantum Wells
• Quantum Anomalous Hall Effect in Graphene from Rashba and Exchange Effects
• Ab initio calculation of the anomalous Hall conductivity by Wannier interpolation
• Interface engineering of quantum Hall effects in digital transition metal oxide heterostructures
• Wien2wannier: From linearized augmented plane waves to maximally localized Wannier functions
• Quantum Anomalous Hall Effect in Graphene Proximity Coupled to an Antiferromagnetic Insulator
• Structural and doping effects in the half-metallic double perovskite $A_2$CrWO${}_6$
• Scalar spin chirality and quantum Hall effect on a triangular lattice
• Electrically tunable quantum anomalous Hall effect in 5d transition-metal adatoms on graphene
• Quantized Anomalous Hall Effect in Two-Dimensional Ferromagnets - Quantum Hall Effect from Metal -
• Orbital-Angular-Momentum Based Origin of Rashba-Type Surface Band Splitting
• Topological insulators from complex orbital order in transition-metal oxides heterostructures
• Electronic structure study of double perovskites $A_2$FeReO${}_6$ (A=Ba,Sr,Ca) and Sr${}_{2}M$MoO${}_6$ (M=Cr,Mn,Fe,Co) by LSDA and LSDA+U
• Hidden Multiple-spin Interactions as an Origin of Spin Scalar Chiral Order in Frustrated Kondo Lattice Models
• Possible interaction driven topological phases in (111) bilayers of LaNiO3
• The honeycomb lattice with multi-orbital structure: topological and quantum anomalous Hall insulators with large gaps
• Chern insulators from heavy atoms on magnetic substrates
• Topological Crystalline Insulators in Transition Metal Oxides
• Emergent topological and half semimetallic Dirac Fermions at oxide interfaces
• Tailoring the electronic transitions of NdNiO_3 films through (111)_pc oriented interfaces
• Electronic structure of (LaNiO${}_3$)${}_2$/(LaAlO${}_3$)${}_N$ heterostructures grown along [111]
• Correlation effects in (111) bilayers of perovskite transition-metal oxides
• Doped Mott Insulators in (111) Bilayers of Perovskite Transition-Metal Oxides with a Strong Spin-Orbit Coupling
• Double perovskite heterostructures: Magnetism, Chern bands, and Chern insulators
• Local Electronic and Magnetic Studies of an Artificial La2FeCrO6 Double Perovskite
• Topological phases in layered pyrochlore oxide thin films along the [111] direction
• Hall effect of spin-chirality origin in a triangular-lattice helimagnet Fe1.3Sb
• Mott Electrons in an Artificial Graphenelike Crystal of Rare-Earth Nickelate
• Switchable Quantum Anomalous Hall state in a strongly frustrated lattice magnet
• Lattice distortion effects on topological phases in (LaNiO${}_3$)${}_2$/(LaAlO${}_3$)${}_N$ heterostructures grown along the [111] direction
• Fabrication of (111)-oriented Ca0.5Sr0.5IrO3/SrTiO3 superlattices; a designed playground for honeycomb physics
• Nature of Orbital and Spin Rashba Coupling in the Surface Bands of SrTiO3 and KTaO3
• Design of Mott and topological phases on buckled 3d-oxide honeycomb lattices
• Quantum anomalous Hall phase in (001) double-perovskite monolayers via intersite spin-orbit coupling
• Correlation effects in pyrochlore iridate thin films grown along the $[111]$ direction
• Spin-orbital locked magnetic excitations in a half-metallic double perovskite Ba2FeReO6
• Controlled confinement of half-metallic two-dimensional electron gas in BaTiO3/Ba2FeReO6/BaTiO3 heterostructures: A first-principles study

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• Quantum Anomalous Hall and Half-metallic Phases in Ferromagnetic (111) Bilayers of 4d and 5d Transition Metal Perovskites
• Confinement-driven electronic and topological phases in corundum-derived $3d$-oxide honeycomb lattices
• Anomalous ferromagnetism and magneto-optical Kerr effect in semiconducting double perovskite Ba2NiOsO6 and its (111) (Ba2NiOsO6)/(BaTiO3)10 superlattice
• Anisotropic Magnetoresistance in Multiband Systems: 2DEGs and Polar Metals at Oxide Interfaces
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