Design of Chern Insulating Phases in Honeycomb Lattices

Abstract

The search for robust examples of the magnetic version of topological insulators, referred to as quantum anomalous Hall insulators or simply Chern insulators, so far lacks success. Our groups have explored two distinct possibilities based on multiorbital 3d oxide honeycomb lattices. Each has a Chern insulating phase near the ground state, but materials parameters were not appropriate to produce a viable Chern insulator. Further exploration of one of these classes, by substituting open shell 3d with 4d and 5d counterparts, has led to realistic prediction of Chern insulating ground states. Here we recount the design process, discussing the many energy scales that are active in participating (or resisting) the desired Chern insulator phase.

4 pages

References in corpus (12)

• Quantum Anomalous Hall Effect in Hg${}_{1-y}$Mn${}_y$Te Quantum Wells
• Quantum spin Hall effect in a transition metal oxide Na2IrO3
• Chern insulators from heavy atoms on magnetic substrates
• sd2 Graphene: Kagome Band in Hexagonal lattice
• Emergence of a Chern-insulating state from a semi-Dirac dispersion
• Prediction of High Temperature Quantum Anomalous Hall Effect in Two Dimensional Transition-Metal Oxides
• Confinement-driven transitions between topological and Mott phases in (LaNiO3)${}_N$/(LaAlO3)${}_M$(111) superlattices
• Design of Mott and topological phases on buckled 3d-oxide honeycomb lattices
• 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
• Large orbital moment and spin-orbit enabled Mott transition in the Ising Fe honeycomb lattice BaFe2(PO4)2
• Strain and Spin-Orbit Coupling Induced Orbital-Ordering in Mott Insulator BaCrO3