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.

6 pages, 3 figures

References in corpus (8)

• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Topological Mott Insulators
• Orbital fluctuations in the different phases of LaVO3 and YVO3
• Electronic structure of (LaNiO${}_3$)${}_2$/(LaAlO${}_3$)${}_N$ heterostructures grown along [111]
• Confinement-driven transitions between topological and Mott phases in (LaNiO3)${}_N$/(LaAlO3)${}_M$(111) superlattices
• Chern insulator at a magnetic rocksalt interface
• Interaction-induced quantum anomalous Hall phase in (111) bilayer of LaCoO${}_3$
• Topological magnetic phase in LaMnO${}_3$ (111) bilayer

Cited by in corpus (16)

• Correlation-driven topological phase transition from in-plane magnetized quantum anomalous Hall to Mott insulating phase in monolayer transition metal trichlorides
• Designing light-element materials with large effective spin-orbit coupling
• Transition-Metal Oxide (111) bilayers
• 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
• 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