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

Shin Dongbin, Sato Shunsuke, Hubener Hannes, De Giovannini Umberto, Park Noejung, Rubio Angel

doi:10.48550/arxiv.2010.13646

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

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説明

<jats:title>Abstract</jats:title><jats:p>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.</jats:p>