Charge transfer and hybrid ferroelectricity in (YFeO${}_3$)${}_n$/(YTiO${}_3$)${}_n$ magnetic superlattices

Abstract

Interfaces in oxide heterostructures always provide a fertile ground for emergent properties. Charge transfer from a high energy band to a low energy opponent is naturally expected, as occurring in semiconductor $p$-$n$ junctions. In this study, several exceptional physical phenomena have been predicted in (YFeO${}_3$)${}_n$/(YTiO${}_3$)${}_n$ superlattices. First, the charge transfer between these Mott insulators is in opposite to the intuitive band alignment scenario. Second, hybrid ferroelectricity with a moderate polarization is generated in the $n=2$ magnetic superlattice. Furthermore, the ferroelectric-type distortion can persist even if the ($AB$O${}_3$)${}_2$/($AB$'O${}_3$)${}_2$ system turns to be metallic, rending possible metallic ferroelectricity.

arXiv comment6 pages, 4 figures

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• (LaTiO${}_3$)${}_n$/(LaVO${}_3$)${}_n$ as a model system for unconventional charge transfer and polar metallicity
• Infrared Optical Absorption in Low-spin Fe${}^{2+}$-doped SrTiO${}_3$
• Engineering charge ordering into multiferroicity
• Possible ferrimagnetism and ferroelectricity of half-substituted rare-earth titanate: a first-principles study on Y${}_{0.5}$La${}_{0.5}$TiO${}_3$
• Orientation-dependent ferroelectricity of strained PbTiO${}_3$ films