High-Order Harmonic Generation in Solids: The Role of Intraband Transitions in 
Extreme Nonlinear Optics

Hirori, H.; Sato, S.; Kanemitsu, Y.

doi:10.1021/acs.jpclett.3c03415

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High-Order Harmonic Generation in Solids: The Role of Intraband Transitions in Extreme Nonlinear Optics

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Sato, S.
Center for Computational Sciences, University of Tsukuba;
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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https://doi.org/10.1021/acs.jpclett.3c03415
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jz3c03415_si_001.pdf
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Citation

Hirori, H., Sato, S., & Kanemitsu, Y. (2024). High-Order Harmonic Generation in Solids: The Role of Intraband Transitions in Extreme Nonlinear Optics. The Journal of Physical Chemistry Letters, 15(8), 2184-2192. doi:10.1021/acs.jpclett.3c03415.

Cite as: https://hdl.handle.net/21.11116/0000-000E-78BD-7

Abstract

High-order harmonic generation (HHG) in gases is frequently used nowadays to produce attosecond pulses and coherent radiation in the visible-to-soft X-ray spectral range. HHG in solids is a natural extension of the idea of HHG in gases, and its first observation about ten years ago opened the door to investigations on attosecond electron dynamics in solids and the development of solid-state attosecond light sources. The common process in both types of HHG is nonlinear photocarrier generation, and thus, transitions between different bands (interband transitions) are always important for HHG. As well, in the case of solids, the transitions within a band (intraband transitions) also need to be considered, because efficient carrier acceleration is possible due to them. This Perspective focuses on experimental findings that show how intraband transitions can be controlled because such an understanding will be essential in the development of unique optoelectronics that can operate at petahertz frequencies.