Temporal modulation of second harmonic generation in ferroelectrics by a pulsed electric field

Abstract

We revisit the relationship between electric polarization modulation $\Delta P$ in ferroelectrics induced by a low-frequency pulsed electric field and the corresponding second harmonic intensity modulation $\Delta I_{\mathrm{SH}}$. Using nonlinear response theory, we derive their time-domain expressions linear in the pulse amplitude, revealing that not only the electric field but also its time derivative contributes to $\Delta I_{\mathrm{SH}}$. Furthermore, even when the time-derivative component is negligible, $\Delta I_{\mathrm{SH}}$ can be in antiphase with the pulsed field and thus with $\Delta P$. These theoretical predictions are further supported by real-time simulations of a model for electronic ferroelectrics. Our results demonstrate that the commonly assumed relation $\Delta P\propto \Delta I_{\mathrm{SH}}$ can break down under certain conditions, reflecting the complex-valued and frequency-dependent nature of nonlinear dynamical susceptibilities.

11 pages, 5 figures

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