非绝热非线性光学与量子几何--扭曲施温格效应的应用
Nonadiabatic Nonlinear Optics and Quantum Geometry -- Application to the Twisted Schwinger Effect
摘要：
研究了强相干激光场在固体中诱导非线性光学过程的隧穿机制。该理论是基于扩展的Landau-Zener模型与非绝热几何效应。除了先前已知的整流效应，我们发现两种效应，即完美隧穿和反绝热在快速扫描速度。我们将这一理论应用于扭曲的施温格效应，即，研究了旋转电场作用下粒子对的非绝热产生，并找到了Dirac和Weyl费米子中光谷极化和光电流的非微扰产生机制。
英文摘要：
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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