论文标题
v $ _2 $ o $ $ _3 $的Terahertz流离失所的兴奋
Terahertz displacive excitation of a coherent Raman-active phonon in V$_2$O$_3$
论文作者
论文摘要
涉及光场频率混合的非线性过程为固体中集体模式的超快相干光谱的基础设定了基础。在某些半学和半导体中，在电子系统上激光脉冲激发的差异频率混合以晶格上的替代力可能会产生相干的声子模式的产生。在这里，作为此过程的低频对应物，我们证明了连贯的声子激发可以通过强烈的Terahertz光场的总和频率组件诱导，并耦合到本内电子过渡。这种非线性过程导致在强相关的金属v $ _2 $ o $ _3 $中，拉曼活性声子模式的电荷耦合相干动力学。我们的结果表明，通过Terahertz驱动的电子激发介导的固体中的拉曼活性模式的光学控制，这是一种新的上转化途径。
Nonlinear processes involving frequency-mixing of light fields set the basis for ultrafast coherent spectroscopy of collective modes in solids. In certain semimetals and semiconductors, generation of coherent phonon modes can occur by a displacive force on the lattice at the difference-frequency mixing of a laser pulse excitation on the electronic system. Here, as a low-frequency counterpart of this process, we demonstrate that coherent phonon excitations can be induced by the sum-frequency components of an intense terahertz light field, coupled to intraband electronic transitions. This nonlinear process leads to charge-coupled coherent dynamics of Raman-active phonon modes in the strongly correlated metal V$_2$O$_3$. Our results show a new up-conversion pathway for the optical control of Raman-active modes in solids mediated by terahertz-driven electronic excitation.
