Abstract

High-order harmonic generation (HHG) in a gas phase is beautifully explained by three steps: tunnling ionization, acceleration, and recombination, using a simple-man model [1]. The solid-state counterpart of the first step is tunneling carrier injection, known as Zener tunneling. The vast majority of Zener tunneling treatment for spatially periodic systems relies on a rigid band model. At the same time, electron-hole attraction plays a prominent role in exciton formation. Ikemachi et al. [2] found a chracterstic of tunneling rate promotion due to electron-hole interaction in time-dependent Hartree-Fock simulations. To deeply understand the interaction in nonperturbative optical excitation, we investigate how electron-hole attraction affects the tunneling rate by a real-time simulation.

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