Free carrier induced ferroelectricity in layered perovskites

Abstract

Doping ferroelectrics with carriers is often detrimental to polarization. This makes the design and discovery of metals that undergo a ferroelectric-like transition challenging. In this letter, we show from first principles that the oxygen octahedral rotations in perovskites are often enhanced by electron doping, and this can be used as a means to strengthen the structural polarization in certain hybrid-improper ferroelectrics -- compounds in which the polarization is not stabilized by the long range Coulomb interactions but is instead induced by a trilinear coupling to octahedral rotations. We use this design strategy to predict a cation ordered Ruddlesden-Popper compound that can be driven into a metallic ferroelectric-like phase via electrolyte gating.

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Cited by in corpus (7)

• Polar Metals Taxonomy for Materials Classification and Discovery
• Gating-Induced Mott Transition in NiS${}_2$
• Switchable Electric Dipole from Polaron Localization in Dielectric Crystals
• Polar charge density wave in a superconductor with crystallographic chirality
• Revival of Layered Ferroelectrics in Thin Films
• Anisotropic terahertz optostriction in group-IV monochalcogenide compounds
• Ultrafast non-thermal suppression of ferroelectricity by carrier screening in LiNbO3