Role of electron scattering on the high-order harmonic generation from solids

(submitted), (2020)

Role of electron scattering on the high-order harmonic generation from solids

Chang-Ming Wang, Nicolas Tancogne-Dejean, Massimo Altarelli, Angel Rubio, Shunsuke A. Sato

We extend the semi-classical trajectory description for the high-order harmonic generation~(HHG) from solids by integrating the effect of electron-scattering. Comparing the extended semi-classical trajectory model with a one-dimensional quantum mechanical simulation, we find that the multi-plateau feature of the HHG spectrum is formed by Umklapp scattering under the electron-hole acceleration dynamics by laser fields. Furthermore, by tracing the scattered trajectories in real-space, the model fairly describes the emitted photon energy and the emission timing of the HHG even in the higher plateau regions. We further consider the loss of trajectories by scattering processes with a mean-free-path approximation and evaluate the HHG cutoff energy as a function of laser wavelength. As a result, we find that the trajectory loss by scattering causes the wavelength independence of the HHG from solids.

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arxiv
http://arxiv.org/abs/2004.09049
Notes
This work was supported by the European Research Council (ERC-2015-AdG694097), the Cluster of Excellence ’Advanced Imaging of Matter’ (AIM), and JSTCREST under Grant No. JP-MJCR16N5. S.A.S. gratefully acknowledges the fellowship from the Alexander von Humboldt Foundation.

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