Topological phases in Iridium oxide superlattices: quantized anomalous charge or valley Hall insulators

Abstract

We study topological phases in Iridium (Ir) oxide superlattices of orthorhombic perovskite-type grown along the [001] crystallographic axis. Due to strong spin-orbit coupling of Ir 5d-orbitals and electronic correlation effects, Ir oxide bilayer superlattices display topological magnetic insulators exhibiting quantized anomalous Hall effects. Depending on stacking of two layers, we also found a valley Hall insulator with counter-propagating edge currents from two different valleys and a topological crystalline insulator with edge states protected by the crystal lattice symmetry. In a single layer Ir oxide superlattice, a topological insulator can be achieved, when a strain field is applied to break the symmetry of a glide plane protecting the Dirac points. In the presence of a magnetic ordering or in-plane magnetic field, it turns into a topological magnetic insulator. We discuss essential ingredients for these topological phases and experimental signatures to test our theoretical proposals.

arXiv comment10 pages, 7 figures

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• Topological Phases in Two-Dimensional Materials: A Brief Review
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• Engineering spin-orbital magnetic insulator by tailoring superlattices
• Recent progress on correlated electron systems with strong spin-orbit coupling
• Spin-Orbit Semimetals in the Layer Groups
• Strain-induced nonsymmorphic symmetry breaking and removal of Dirac semimetallic nodal line in an orthoperovskite iridate
• Chiral Ordering Spin Associated Glass like State in SrRuO3SrIrO3 Superlattice
• The iridium double perovskite Sr2YIrO6 revisited: A combined structural and specific heat study
• Antiferromagnetic Dirac Semimetals in Two Dimensions
• Magnetic Orders Proximal to the Kitaev Limit in Frustrated Triangular Systems: Application to Ba${}_3$IrTi${}_2$O${}_9$
• Review of Spin Orbit Coupled Semimetal SrIrO3 in thin film form
• All-in-all-out magnetic domain wall conduction in pyrochlore iridate heterointerface
• Novel spin-orbit coupling driven emergent states in iridate-based heterostructures
• Shadowed triplet pairings in Hund's metals with spin-orbit coupling
• Strain-modulated Slater-Mott crossover of pseudospin-half square-lattice in (SrIrO3)1/ (SrTiO3)1 superlattices
• Topological insulator associated with quantum anomalous Hall phase in ferromagnetic perovskite superlattices
• Quantum Anomalous Hall and Half-metallic Phases in Ferromagnetic (111) Bilayers of 4d and 5d Transition Metal Perovskites
• Odd-Parity Superconductivity Driven by Octahedra Rotations in Iridium Oxides
• Helical Majorana fermions at the interface of Weyl semimetal and d-wave superconductor: Application to Iridates and high-Tc Cuprates
• Tunneling Conductance in a Two-dimensional Dirac Semimetal Protected by Non-symmorphic Symmetry
• Quasi-2D anomalous Hall Mott insulator of topologically engineered Jeff =1/2 electrons
• Reconciling monolayer and bilayer $J_{\mathrm{eff}}=1/2$ square lattices in hybrid oxide superlattice
• Spin and electric currents induced by a spin-motive force in two-dimensional Dirac semimetals protected by nonsymmorphic symmetries