Nonadiabatic nonlinear optics and quantum geometry - Application to the twisted 
Schwinger effect

Takayoshi, Shintaro; Wu, Jianda; Oka, Takashi

doi:10.21468/SciPostPhys.11.4.075

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Nonadiabatic nonlinear optics and quantum geometry - Application to the twisted Schwinger effect

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Oka, Takashi
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Takayoshi, S., Wu, J., & Oka, T. (2021). Nonadiabatic nonlinear optics and quantum geometry - Application to the twisted Schwinger effect. SciPost Physics Core, 11(4): 075, pp. 1-24. doi:10.21468/SciPostPhys.11.4.075.

Cite as: https://hdl.handle.net/21.11116/0000-0009-A4CF-5

Abstract

We study the tunneling mechanism of nonlinear optical processes in solids induced by strong coherent laser fields. The theory is based on an extension of the Landau-Zener model with nonadiabatic geometric effects. In addition to the rectification effect known previously, we find two effects, namely perfect tunneling and counterdiabaticity at fast sweep speed. We apply this theory to the twisted Schwinger effect, i.e., nonadiabatic pair production of particles by rotating electric fields, and find a nonperturbative generation mechanism of the opto-valley polarization and photo-current in Dirac and Weyl fermions.