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- W4386608049 abstract "Barium titanate, $mathrm{BaTi}{mathrm{O}}_{3}$ (BTO), has emerged as a promising electro-optic material with applications in silicon photonics. It boasts one of the largest known electro-optic coefficients; however, the origin of this giant electro-optic response has not been investigated in detail and is poorly understood. Here we report on a first-principles study of the electro-optic or Pockels tensor in tetragonal P4mm BTO. We find good agreement with experiment if the P4mm structure is viewed as a dynamic average of four lower symmetry $mathit{Cm}$ structures. The large value of the Raman component of the EO coefficient is attributed to a low frequency and strong electron-phonon coupling of the lowest optical mode, and we trace the equally large piezoelectric contribution to the large components of the piezoelectric and elasto-optic tensors." @default.
- W4386608049 created "2023-09-12" @default.
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- W4386608049 date "2023-09-11" @default.
- W4386608049 modified "2023-09-29" @default.
- W4386608049 title "Nature of electro-optic response in tetragonal <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi>BaTiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>" @default.
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- W4386608049 doi "https://doi.org/10.1103/physrevb.108.115201" @default.
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