High-order harmonics from backscattering of delocalized electrons

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...

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Bibliographic Details
Main Authors: Rost, J.M (Author), Saalmann, U. (Author), Yu, C. (Author)
Format: Article
Language:English
Published: American Physical Society 2022
Subjects:
Backscattering
Chains length
Delocalized electron
Electron backscattering
Electrons
Finite chains
Harmonic analysis
Harmonic yields
High order harmonics
High order harmonics generation
Higher order harmonics
Intuitive understanding
Translational symmetry
Online Access:View Fulltext in Publisher
Description
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.
ISBN:24699926 (ISSN)
DOI:10.1103/PhysRevA.105.L041101

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