Large Elasto-Optic Effect in Epitaxial PbTiO_{3} Films

Physical Review Letters
Lan ChenL Bellaiche

Abstract

First-principles calculations are performed to investigate the elasto-optic properties of four different structural phases in (001) epitaxial PbTiO_{3} films under tensile strain: a tetragonal (T) phase and an orthorhombic (O) phase, which are the ground states for small and large strain, respectively, and two low-symmetry, monoclinic phases of Cm and Pm symmetries that have low total energy in the intermediate strain range. It is found that the refractive indices of the T and O phases respond differently to epitaxial strain, evidenced by a change of sign of their effective elasto-optic coefficients, and as a result of presently discovered correlations between refractive index, axial ratio, and magnitude of the ferroelectric polarization. The difference in refractive indices between T and O and the existence of such correlations naturally lead to large elasto-optic coefficients in the Cm and Pm states in the intermediate strain range, because Cm structurally bridges the T and O phases (via polarization rotation and a rapid change of its axial ratio) and Pm adopts a similar axial ratio and polarization magnitude to Cm. The present results therefore broaden the palette of functionalities of ferroelectric materials, and suggest ne...Continue Reading

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Citations

Dec 17, 2016·Physical Chemistry Chemical Physics : PCCP·Cheng LuGang Bao
Jan 5, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Yurong YangL Bellaiche
Jul 26, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Shenghua LiuMin Xiao
Jul 18, 2020·Physical Review Letters·Zhijun JiangL Bellaiche
Oct 13, 2018·Physical Review Letters·Qi-Jun YeXin-Zheng Li

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