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Dynamical amplification of electric polarization through nonlinear phononics in 2D SnTe

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摘要 Ultrafast optical control of ferroelectricity using intense terahertz fields has attracted significant interest.Here we show that the nonlinear interactions between two optical phonons in SnTe,a two-dimensional in-plane ferroelectric material,enables a dynamical amplification of the electric polarization within subpicoseconds time domain.Our first-principles time-dependent simulations show that the infrared-active out-of-plane phonon mode,pumped to nonlinear regimes,spontaneously generates in-plane motions,leading to rectified oscillations in the in-plane electric polarization.We suggest that this dynamical control of ferroelectric material,by nonlinear phonon excitation,can be utilized to achieve ultrafast control of the photovoltaic or other nonlinear optical responses.
出处 《npj Computational Materials》 SCIE EI CSCD 2020年第1期155-162,共8页 计算材料学(英文)
基金 We further acknowledge financial support from the European Research Council(ERC-2015-AdG-694097) the Clusters of Excellence Advanced Imaging of Matter(AIM,EXC 2056,ID 390715994) Grupos Consolidados(IT1249-19),and SFB925.D.S.acknowledges the support from National Research Foundation of Korea(NRF-2019R1A6A3A03031296) N.P.was supported by National Research Foundation of Korea(NRF-2019R1A2C2089332) The Flatiron Institute is a division of the Simons Foundation.
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