4.6 Article

High-order harmonics from backscattering of delocalized electrons

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PHYSICAL REVIEW A
卷 105, 期 4, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.105.L041101

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It is demonstrated that electron backscattering can enhance high-order-harmonic generation in periodic systems with broken translational symmetry. By deriving a finite chain of atoms as a paradigm, the harmonic cutoff caused by electrons backscattered from the edges of the chain is explored, and it is shown that there is a maximum in the harmonic yield when the quiver amplitude of the driven electrons is twice the chain length. To gain an intuitive understanding of the quantum results, a refined semiclassical trajectory model with finite electron-hole separation after tunneling is developed. It is also demonstrated that the same tunnel exit applies to interband harmonics in conventional periodic solid-state systems.
It is shown that electron backscattering can enhance high-order-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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