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Large linear and nonlinear electro-optic coefficients in two-dimensional ferroelectrics

Abstract : Analytical derivations and first-principles calculations are performed to investigate the electro-optic (EO) response of the two-dimensional ferroelectric SnS in its monolayer form. In addition to derive the formula for EO coefficients for two-dimensional systems, large linear and nonlinear electro-optic coefficients are discovered, along with a strongly nonlinear electro-optic response as a function of electric field. The origin of these electro-optic responses is further found and involves a few specific phonon modes, in general, and the evolution of their frequencies and atomic characteristics under electric fields, in particular. Large linear and nonlinear electro-optic coefficients can be found in other two-dimensional ferroelectrics, paving the way for potential optical device applications.
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Submitted on : Friday, September 2, 2022 - 2:12:58 PM
Last modification on : Tuesday, September 13, 2022 - 4:18:23 PM

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Zhijun Jiang, Charles Paillard, Hugh O H Churchill, Minggang Xia, Shengli Zhang, et al.. Large linear and nonlinear electro-optic coefficients in two-dimensional ferroelectrics. Physical Review B, American Physical Society, 2022, 106 (8), pp.L081404. ⟨10.1103/PhysRevB.106.L081404⟩. ⟨hal-03767985⟩

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