Design of Mott and topological phases on buckled 3d-oxide honeycomb lattices

Abstract

Perovskite bilayers with (111)-orientation combine a honeycomb lattice as a key feature with the strongly correlated, multiorbital nature of electrons in transition metal oxides. In a systematic DFT+$U$ study of (111)-oriented (La$X$O${}_3$)${}_2$/(LaAlO${}_3$)${}_4$ superlattices, we establish trends in the evolution of ground states versus band filling in (111)-oriented (La$X$O${}_3$)${}_2$/(LaAlO${}_3$)${}_4$ superlattices, with $X$ spanning the entire $3d$ transition metal series. The competition between local quasi-cubic and global triangular symmetry triggers unanticipated broken symmetry phases, with mechanisms ranging from Jahn-Teller distortions, to charge-, spin-, and orbital-ordering. LaMnO${}_3$, where spin-orbit coupling opens a sizable gap in the Dirac-point Fermi surface, emerges as a topological Chern insulator.

arXiv comment6 pages, 3 figures

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• High-temperature large-gap quantum anomalous Hall insulator in ultrathin double perovskite films
• Tuning ferromagnetic BaFe${}_2$(PO${}_4$)${}_2$ through a high Chern number topological phase
• 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
• Confinement-driven electronic and topological phases in corundum-derived $3d$-oxide honeycomb lattices
• Octahedral coupling in (111)- and (001)-oriented La${}_{2/3}$Sr${}_{1/3}$MnO${}_3$/SrTiO${}_3$ heterostructures
• Chern insulating phases and thermoelectric properties of EuO/MgO(001) superlattices
• Imaging the suppression of ferromagnetism in LaMnO${}_3$ by metallic overlayers
• Band crossings in honeycomb-layered transition metal compounds
• Artificial oxide heterostructures with non-trivial topology
• Interaction-driven spin-orbit effects and Chern insulating phases in corundum-based $4d$ and $5d$ oxide honeycomb lattices
• Design of Chern Insulating Phases in Honeycomb Lattices