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.
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- 1 2 Shintaro Takayoshi,
- 3 Jianda Wu,
- 1 4 5 Takashi Oka
- 1 Max-Planck-Institut für Physik komplexer Systeme / Max Planck Institute for the Physics of Complex Systems
- 2 甲南大学 / Konan University
- 3 上海交通大学 / Shanghai Jiao Tong University [SJTU]
- 4 Max-Planck-Institut für Chemische Physik fester Stoffe / Max Planck Institute for Chemical Physics of Solids
- 5 Institute for Solid State Physics, University of Tokyo [ISSP]