论文标题
电子散射在固体中高阶谐波产生中的作用
Role of electron scattering on the high-order harmonic generation from solids
论文作者
论文摘要
我们通过整合电子散射的效果来扩展固体的高阶谐波生成〜（HHG）的半古典轨迹描述。将扩展的半古典轨迹模型与一维量子机械模拟进行比较，我们发现HHG光谱的多斑点特征是由激光场下的umklapp散射在电子孔加速动力学下形成的。此外，通过在真实空间中追踪散射的轨迹，该模型即使在较高的高原区域也可以公平地描述HHG的发射光子能量和发射时机。我们进一步考虑通过具有平均无路径近似的散射过程来考虑轨迹的丧失，并评估HHG截止能随激光波长的函数。结果，我们发现散射轨迹损失会导致HHG从固体中的波长独立性。
We extend the semi-classical trajectory description for the high-order harmonic generation~(HHG) from solids by integrating the effect of electron-scattering. Comparing the extended semi-classical trajectory model with a one-dimensional quantum mechanical simulation, we find that the multi-plateau feature of the HHG spectrum is formed by Umklapp scattering under the electron-hole acceleration dynamics by laser fields. Furthermore, by tracing the scattered trajectories in real-space, the model fairly describes the emitted photon energy and the emission timing of the HHG even in the higher plateau regions. We further consider the loss of trajectories by scattering processes with a mean-free-path approximation and evaluate the HHG cutoff energy as a function of laser wavelength. As a result, we find that the trajectory loss by scattering causes the wavelength independence of the HHG from solids.
