论文标题
使用高谐波检查跟踪超快固态动力学
Tracking ultrafast solid-state dynamics using high harmonic spectroscopy
论文作者
论文摘要
我们通过详细研究二氧化钒中的绝缘体到金属过渡，建立了时间分辨的高谐波生成（TR-HHG）作为强大相关材料中光诱导动力学的强大光谱。我们通过将测量结果与已建立的动量分辨超快电子衍射和理论密度功能计算进行比较。 TR-HHG允许区分单个动态通道，包括过渡到热力学隐藏相。另外，在广泛的激发量范围内，HHG产率在平衡单斜相相中的相干声子的频率特征进行了调节。这些结果表明，TR-HHG能够通过其对带结构的敏感性跟踪固体中的复杂动力学。
We establish time-resolved high harmonic generation (tr-HHG) as a powerful spectroscopy for photoinduced dynamics in strongly correlated materials through a detailed investigation of the insulator-to-metal transitions in vanadium dioxide. We benchmark our technique by comparing our measurements to established momentum-resolved ultrafast electron diffraction, and theoretical density functional calculations. Tr-HHG allows distinguishing of individual dynamic channels, including a transition to a thermodynamically hidden phase. In addition, the HHG yield is shown to be modulated at a frequency characteristic of a coherent phonon in the equilibrium monoclinic phase over a wide range of excitation fluences. These results demonstrate that tr-HHG is capable of tracking complex dynamics in solids through its sensitivity to the band structure.
