Transition-Metal Oxide (111) bilayers

Abstract

Correlated electron systems on a honeycomb lattice have emerged as a fertile playground to explore exotic electronic phenomena. Theoretical and experimental work has appeared to realize novel behavior, including quantum Hall effects and valleytronics, mainly focusing on van der Waals compounds, such as graphene, chalcogenides, and halides. In this article, we review our theoretical study on perovskite transition-metal oxides (TMOs) as an alternative system to realize such exotic phenomena. We demonstrate that novel quantum Hall effects and related phenomena associated with the honeycomb structure could be artificially designed by such TMOs by growing their heterostructures along the [111] crystallographic axis. One of the important predictions is that such TMO heterostructures could support two-dimensional topological insulating states. The strong correlation effects inherent to TM $d$ electrons further enrich the behavior.

11 pages, 8 figures

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• Perspective: Strongly correlated and topological states in [111] grown transition metal oxide thin films and heterostructures
• Flat Bands and Ferrimagnetic Order in Electronically Correlated Dice-Lattice Ribbons
• Strain-induced pseudo-magnetic field in $\alpha -{\mathcal{T}}_3$ lattice
• Symmetry and correlation effects on band structure explain the anomalous transport properties of (111) LaAlO${}_3$/SrTiO${}_3$
• Strain and onsite-correlation tunable quantum anomalous Hall phases in ferromagnetic (111) LaXO${}_3$ bilayers (X$=$Pd, Pt)
• Electronic structure of a graphene-like artificial crystal of $NdNi{O}_3$
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• Inducing ferromagnetism by structural engineering in a strongly spin-orbit coupled oxide
• Pseudospin-one particles in the time-periodic dice lattice: A new approach to transport control