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Article Dans Une Revue Physical Review Letters Année : 2020

Linear Versus Nonlinear Electro-Optic Effects in Materials

Résumé

Two schemes are proposed to compute the nonlinear electro-optic (EO) tensor for the first time. In the first scheme, we compute the linear EO tensor of the structure under a finite electric field, while we compute the refractive index of the structure under a finite electric field in the second scheme. Such schemes are applied to Pb(Zr,Ti)O3 and BaTiO3 ferroelectric oxides. It is found to reproduce a recently observed feature, namely why Pb(Zr0.52Ti0.48)O3 adopts a mostly linear EO response while BaTiO3 exhibits a strongly nonlinear conversion between electric and optical properties. Furthermore, the atomistic insight provided by the proposed ab-initio scheme reveals the origin of such qualitatively different responses, in terms of the field-induced behavior of the frequencies of some phonon modes and of some force constants.
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Dates et versions

hal-03211658 , version 1 (28-04-2021)

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Zhijun Jiang, Charles Paillard, Hongjun Xiang, L. Bellaiche. Linear Versus Nonlinear Electro-Optic Effects in Materials. Physical Review Letters, 2020, 125 (1), pp.017401. ⟨10.1103/PhysRevLett.125.017401⟩. ⟨hal-03211658⟩
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