High harmonic generation (HHG) is usually described by the laser-induced recollision of particlelike electrons, which lies at the heart of attosecond physics and also inspires numerous attosecond spectroscopic methods. Here, we demonstrate that the wavelike behavior of electrons plays an important role in solid HHG. By taking an analogy to the Huygens-Fresnel principle, an electron wave perspective on solid HHG is proposed by using the wavelet stationary-phase method. From this perspective, we have explained the deviation between the cutoff law predicted by the particlelike recollision model and the numerical simulation of semiconductor Bloch equations. Moreover, the emission times of HHG can be well predicted with our method involving the wave property of electrons. However, in contrast, the prediction with the particlelike recollision model shows obvious deviations compared to the semiconductor Bloch equations simulation. The wavelike properties of the electron motion can also be revealed by the HHG in a two-color field.

中文翻译：

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固体中高次谐波产生的惠更斯-菲涅耳图

高次谐波产生 (HHG) 通常由激光诱导的类粒子电子重碰撞来描述，这是阿秒物理学的核心，也激发了许多阿秒光谱方法。在这里，我们证明电子的波状行为在固体 HHG 中起着重要作用。类比惠更斯-菲涅耳原理，利用小波固定相法提出固体HHG的电子波透视。从这个角度，我们解释了类粒子再碰撞模型预测的截止规律与半导体布洛赫方程数值模拟之间的偏差。此外，我们的方法可以很好地预测 HHG 的发射时间，该方法涉及电子的波动性。然而，相比之下，与半导体布洛赫方程模拟相比，使用类粒子再碰撞模型的预测显示出明显的偏差。HHG 在双色场中也可以揭示电子运动的波状特性。