论文标题
轻驱动相干晶格动力学的量子理论
Quantum theory of light-driven coherent lattice dynamics
论文作者
论文摘要
暴露于强烈的电磁辐射可以在固体的晶体结构中引起扭曲和对称性破裂，从而为其性质的全光控制提供了途径。在此手稿中，我们制定了一种统一的理论方法，以描述存在外部驾驶场，电子波和声子 - Phonon相互作用以及量子核效应的相干晶格动力学。可以无缝地解释相干声子激发的主要机制 - 包括红外吸收，置换激发，非弹性刺激的拉曼散射和离子拉曼散射。我们将这种形式主义应用于由两个耦合的声子模式组成的模型，在其中我们说明了量子核对离子拉曼散射引起的结构畸变的影响。除了验证相干晶格动力学的广泛就业古典模型外，我们的工作还提供了一种多功能方法，可以有条不紊地探索量子核效应的出现，这在水晶晶格对强场的结构响应中。
The exposure to intense electromagnetic radiation can induce distortions and symmetry breaking in the crystal structure of solids, providing a route for the all-optical control of their properties. In this manuscript, we formulate a unified theoretical approach to describe the coherent lattice dynamics in presence of external driving fields, electron-phonon and phonon-phonon interactions, and quantum nuclear effects. The main mechanisms for the excitation of coherent phonons - including infrared absorption, displacive excitation, inelastic stimulated Raman scattering, and ionic Raman scattering - can be seamlessly accounted for. We apply this formalism to a model consisting of two coupled phonon modes, where we illustrate the influence of quantum nuclei on structural distortions induced by ionic Raman scattering. Besides validating the widely-employed classical models for the coherent lattice dynamics, our work provides a versatile approach to methodically explore the emergence of quantum nuclear effects in the structural response of crystal lattice to strong fields.
