论文标题
通过周期性中断增强高阶谐波：从反向散射到杂质状态
Enhanced high-order harmonics through periodicity breaks: from backscattering to impurity states
论文作者
论文摘要
最近已经建立了DELACALIZED电子的反向散射[Phys。 Rev. A 105，L041101（2022）]作为在转化对称性损坏的周期系统中增强高阶谐波产生（HHG）的机制。在这里，我们研究了原子链中可变空间间隙的这种效果。通过数值传播多电子动力学，我们发现增强的HHG并以两种机制识别其起源，具体取决于间隙大小，无论是从杂质状态而进行反向散射或增强的隧道。由于宽大的原子链在统一的环境中表现出杂质和空缺，因此它提供了洞察周期性中断如何在不同情况下影响HHG。
Backscattering of delocalized electrons has been recently established [Phys. Rev. A 105, L041101 (2022)] as a mechanism to enhance high-order harmonic generation (HHG) in periodic systems with broken translational symmetry. Here we study this effect for a variable spatial gap in an atomic chain. Propagating the many-electron dynamics numerically, we find enhanced HHG and identify its origin in two mechanisms, depending on the gap size, either backscattering or enhanced tunneling from an impurity state. Since the gapped atomic chain exhibits both impurities and vacancies in a unified setting, it provides insight how periodicity breaks influence HHG in different scenarios.
