Optical control of vibrational coherence triggered by an ultrafast phase transition
Optical control of vibrational coherence triggered by an ultrafast phase transition
复制标题
DOI：
10.1103/physrevb.99.220302
复制
发表时间：
2019-06-07
影响因子：
3.7
通讯作者：
Johnson, S. L.
中科院分区：
文献类型：
--
作者：
Neugebauer, M. J.;Huber, T.;Johnson, S. L.
采用飞秒时间分辨 X 射线衍射来研究 K0.3MoO3 中与电荷密度波相关的周期性晶格畸变 (PLD) 的动力学。使用多脉冲方案，我们展示了通过重新激发电子态来延长未失真结构的 PLD 相干振荡寿命的能力。这表明有可能进入一种状态，其中势能景观的对称性对应于高对称性相，但导致相干动力学阻尼的散射路径仍然可以通过改变电子态布居来控制。所证明的对相干时间的控制为相干晶格态的操纵提供了不同的途径。
Femtosecond time-resolved x-ray diffraction is employed to study the dynamics of the periodic lattice distortion (PLD) associated with the charge-density wave in K0.3MoO3. Using a multipulse scheme we show the ability to extend the lifetime of coherent oscillations of the PLD about the undistorted structure through reexcitation of the electronic states. This suggests that it is possible to enter a regime where the symmetry of the potential energy landscape corresponds to the high-symmetry phase but the scattering pathways that lead to the damping of coherent dynamics are still controllable by altering the electronic state population. The demonstrated control over the coherence time offers different routes for the manipulation of coherent lattice states.