Title: Time-dependent population imaging for solid high harmonic generation,
Abstract: We propose an intuitive method, called time-dependent population imaging
(TDPI), to map the dynamical processes of high harmonic generation (HHG) in
solids by solving the time-dependent Schrödinger equation (TDSE). It is
shown that the real-time dynamical characteristics of HHG in solids, such as
the instantaneous photon energies of emitted harmonics, can be read directly
from the energy-resolved population oscillations of electrons in the TDPIs.
Meanwhile, the short and long trajectories of solid HHG are illustrated clearly
from TDPI. By using the TDPI, we also investigate the effects of
carrier-envelope phase (CEP) in few-cycle pulses and intuitively demonstrate
the HHG dynamics driven by two-color fields. Our results show that the TDPI
provides a powerful tool to study the ultrafast dynamics in strong fields for
various laser-solid configurations and gain an insight into HHG processes in
solids.