论文标题
2D SNTE中的非线性语音：一种具有声子动力学放大的铁电材料
Nonlinear phononics in 2D SnTe: a ferroelectric material with phonon dynamical amplification of electric polarization
论文作者
论文摘要
使用强烈的Terahertz田地对铁电的超快光学控制引起了重大兴趣。在这里，我们表明，SNTE中两个光学声子（一种二维的平板内铁电材料）之间的非线性相互作用可以使Subpicoseconds时域内的电极化的动态扩增。我们的第一个原则时间依赖性模拟表明，泵送至非线性方案的红外活性非平面声子模式自发产生面内运动，从而导致平面电力极化的整流振荡。我们建议，通过非线性声子激发对铁电材料的这种动力控制可以用于实现对光伏或其他非线性光学响应的超快控制。
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 non-linear optical responses.
