High-order harmonics from backscattering of delocalized electrons
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...
Main Authors: | , , |
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Format: | Article |
Language: | English |
Published: |
American Physical Society
2022
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Subjects: | |
Online Access: | View Fulltext in Publisher |
Summary: | 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. © 2022 authors. Published by the American Physical Society. |
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ISBN: | 24699926 (ISSN) |
DOI: | 10.1103/PhysRevA.105.L041101 |