Double perovskite heterostructures: Magnetism, Chern bands, and Chern insulators

Abstract

Experiments demonstrating the controlled growth of oxide heterostructures have raised the prospect of realizing topologically nontrivial states of correlated electrons in low dimensions. Here, we study heterostructures consisting of {111}-bilayers of double perovskites separated by inert band insulators. In bulk, these double perovskites have well-defined local moments interacting with itinerant electrons leading to high temperature ferromagnetism. Incorporating spin-orbit coupling in the two-dimensional honeycomb geometry of a {111}-bilayer, we find a rich phase diagram with tunable ferromagnetic order, topological Chern bands, and a C=2 Chern insulator regime. An effective two-band model of Zeeman-split j=3/2 states captures this nontrivial band topology. Our results are of broad relevance to oxide materials such as Sr2FeMoO6, Ba2FeReO6, and Sr2CrWO6.

7 pgs,7 figs. Version to appear in PRL

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• Growth and engineering of perovskite SrIrO3 thin films
• Design of Mott and topological phases on buckled 3d-oxide honeycomb lattices
• Flat Bands and Ferrimagnetic Order in Electronically Correlated Dice-Lattice Ribbons
• Quantum anomalous Hall phase in (001) double-perovskite monolayers via intersite spin-orbit coupling
• Transition-Metal Oxide (111) bilayers
• Chern Number Tunable Quantum Anomalous Hall Effect in Compensated Antiferromagnets
• Coexistence of topological Weyl and nodal-ring states in ferromagnetic and ferrimagnetic double perovskites
• Intrinsic large gap quantum anomalous Hall insulators in La$X$ ($X$=Br, Cl, I)
• Geometrical lattice engineering of complex oxide heterostructures: a designer approach to emergent quantum states
• High-temperature large-gap quantum anomalous Hall insulator in ultrathin double perovskite films
• Independence of surface morphology and reconstruction during the thermal preparation of perovskite oxide surfaces
• SmO thin films: a flexible route to correlated flat bands with nontrivial topology
• Electronic structure and magnetic properties of 3d-4f double perovskite material
• Tuning ferromagnetic BaFe${}_2$(PO${}_4$)${}_2$ through a high Chern number topological phase
• Eight fold quantum Hall phases in a time reversal symmetry broken tight binding model
• Magnetic and nematic orders of the 2DEG at oxide (111) surfaces and interfaces
• Large orbital moment and spin-orbit enabled Mott transition in the Ising Fe honeycomb lattice BaFe2(PO4)2
• Large Chern Number Topological Superfluids in Coupled Layer System
• Correlations and entanglement in flat band models with variable Chern numbers
• Theory of magnetism in La${}_2$NiMnO${}_6$
• Quantum Anomalous Hall and Half-metallic Phases in Ferromagnetic (111) Bilayers of 4d and 5d Transition Metal Perovskites
• Topological insulator associated with quantum anomalous Hall phase in ferromagnetic perovskite superlattices
• Confinement-driven electronic and topological phases in corundum-derived $3d$-oxide honeycomb lattices
• Emergent dome of nematic order around a quantum anomalous Hall critical point
• Multitude of Topological Phase Transitions in Bipartite Dice and Lieb Lattices with Interacting Electrons and Rashba Coupling
• Emergent Haldane Model and Photon-Valley Locking in Chiral Cavities
• Floquet topological phase transitions in a kicked Haldane-Chern insulator
• Controlled confinement of half-metallic two-dimensional electron gas in BaTiO3/Ba2FeReO6/BaTiO3 heterostructures: A first-principles study
• Magnetic excitations in double perovskite iridates La${}_2$$M$IrO${}_6$ ($M$ = Co, Ni, and Zn) mediated by 3$d$-5$d$ hybridization
• Anomalous ferromagnetism and magneto-optical Kerr effect in semiconducting double perovskite Ba2NiOsO6 and its (111) (Ba2NiOsO6)/(BaTiO3)10 superlattice
• Generating and detecting topological phases with higher Chern number
• Individual band with higher Chern numbers in double perovskite {001} monolayers
• Anisotropic Magnetoresistance in Multiband Systems: 2DEGs and Polar Metals at Oxide Interfaces
• Magnetic and Electronic Properties of Spin-Orbit Coupled Dirac Electrons on a $(001)$ Thin Film of Double Perovskite Sr${}_2$FeMoO${}_6$
• Topological states constructed by two different trivial quantum wires
• Site-selective polar compensation of Mott electrons in a double perovskite heterointerface
• Extended Haldane model -- a modern gateway to topological insulators
• Design of Chern Insulating Phases in Honeycomb Lattices
• Large-Gap Quantum Anomalous Hall Effect in Monolayer Halide Perovskite