Coupling between tilts and charge carriers at polar-nonpolar perovskite interfaces

Bennett, Daniel; Aguado-Puente, Pablo; Artacho, Emilio; Bristowe, Nicholas C.

Abstract

The phenomenological theory for the polar instability giving rise to a two-dimensional electron gas at perovskite interfaces is hereby extended to include the coupling to perovskite tilts. A Landau theory for homogeneous tilts is first explored, setting the scene for the further, more realistic Landau-Ginzburg theory describing varying tilt amplitudes across a thin film. The theory is also generalized to account for the response to an applied electric field normal to the interface, which allows a finer control on phase transitions. The conventionally described physics of a single metal-insulator transition is substantially enriched by the coupling, the model describing various scenarios with one or two transitions, possibly continuous or discontinuous. First-principles calculations permit the estimation of the parameters defining the model, which have been calculated for the interface between lanthanum aluminate and strontium titanate.

Citation

Bennett, D., Aguado-Puente, P., Artacho, E., & Bristowe, N. C. (2022). Coupling between tilts and charge carriers at polar-nonpolar perovskite interfaces. Physical Review B, 106, Article 094106. https://doi.org/10.1103/PhysRevB.106.094106

• Journal Article Type: Article
• Acceptance Date: Sep 15, 2022
• Online Publication Date: Sep 28, 2022
• Publication Date: 2022
• Deposit Date: Sep 21, 2022
• Journal: Physical Review B
• Print ISSN: 2469-9950
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 106
• Article Number: 094106
• DOI: https://doi.org/10.1103/PhysRevB.106.094106
• Public URL: https://durham-repository.worktribe.com/output/1190983
• Related Public URLs: https://arxiv.org/abs/2206.13555