离域电子背散射的高次谐波
High harmonics from backscattering of delocalized electrons
摘要：
结果表明，电子背散射可以增强平移对称性破缺的周期系统中的高次谐波产生。范例，我们推导出一个有限的原子链的谐波截止由于电子从链的边缘背散射，并证明了最大的谐波产量，如果驱动电子的振幅的两倍等于链长。为了直观地理解我们的量子结果，我们发展了一个改进的半经典轨道模型，在隧穿后具有有限的电子-空穴分离。我们证明了同样的“隧道出口”也适用于传统的周期性固态系统中的带间谐波。
英文摘要：
It is shown that electron backscattering can enhance high-harmonic generation in periodic systems with broken translational symmetry. Paradigmatically, we derive for a finite chain of atoms the harmonic cutoff due to electrons backscattered from the edges of the chain and demonstrate a maximum in the harmonic yield if twice the quiver amplitude of the driven electrons equals the chain length. For an intuitive understanding of our quantum results we develop a refined semiclassical trajectory model with finite electron-hole separation after tunneling. We demonstrate that the same "tunnel exit" also holds for interband harmonics in conventional periodic solid-state systems.
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