Nonadiabatic effect on temporal double-slit interference structures in an orthogonal two-color laser field

Abstract

We theoretically investigate the temporal double-slit interference (DSI) structures in photoelectron momentum distribution driven by an orthogonally polarized two-color (OTC) laser field and focus on the nonadiabatic effect on the subcycle electron dynamics. Distinct discrepancies in the interference structures simulated with a time-dependent Schr\"odinger equation (TDSE) and an adiabatic semiclassical Monte Carlo approach are observed. By adopting the initial conditions derived from the nonadiabatic tunneling picture into the Monte Carlo algorithm, the improved nonadiabatic model well reproduces the TDSE result. Further analysis shows that the improvement is mainly attributed to the nonzero electron initial longitudinal velocity from the nonadiabatic tunneling and moreover, its influence on the subsequent electron dynamics is revealed. Our work demonstrates the sensitivity of the temporal DSI structures in an OTC field to the exit momentum, providing a way for comprehension of the nonadiabatic tunneling electron dynamics.