论文标题
部分可观测时空混沌系统的无模型预测
Two-dimensional THz spectroscopy of nonlinear phononics in the topological insulator $\mathrm{MnBi}_2\mathrm{Te}_4$
论文作者
论文摘要
单周期THZ电场与拓扑绝缘体$ \ MATHRM {MNBI} _2 \ MATHRM {TE} _4 $ TRIGGERS强烈触及的晶格动力学的相互作用，促进了本来是非交互的Raman Activive raman Active $ e_g $ e_ $ $ $ $ $ $） - 促进了完全连贯的能量转移 - 二维（2D）THZ光谱与基于经典运动和对称分析的经典方程式结合了建模揭示了拉曼活性$ e_g $ phonon激发的多阶段过程。在此过程中，THZ电场首先准备一个连贯的IR-Active $ e_u $ Phononic状态，然后与该状态进行交互，以有效激发$ e_g $ phonon。
The interaction of a single-cycle THz electric field with the topological insulator $\mathrm{MnBi}_2\mathrm{Te}_4$ triggers strongly anharmonic lattice dynamics, promoting fully coherent energy transfer between the otherwise non-interacting Raman-active $E_g$ and infrared (IR)-active $E_u$ phononic modes. Two-dimensional (2D) THz spectroscopy combined with modeling based on the classical equations of motion and symmetry analysis reveals the multi-stage process underlying the excitation of the Raman-active $E_g$ phonon. In this process, the THz electric field first prepares a coherent IR-active $E_u$ phononic state and subsequently interacts with this state to efficiently excite the $E_g$ phonon.
