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

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.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Physical Review B, 2022, 106(9), 094106

Editorial: American Physical Society

 Fecha de publicación: 01/09/2022

Nº de páginas: 16

Tipo de publicación: Artículo de Revista

 DOI: 10.1103/PhysRevB.106.094106

ISSN: 1098-0121,1550-235X,2469-9950,2469-9969

 Proyecto español: CEX2020-001038-M

Url de la publicación: https://doi.org/10.1103/PhysRevB.106.094106