We investigate ultra-fast coherent quantum dynamics of undoped BaBiO3 driven by a strong laser pulse. Our calculations demonstrate that in a wide range of radiation frequencies and intensities the system undergoes a transient change from the insulating to the metallic state, where the charge density wave and the corresponding energy spectrum gap vanish. The transition takes place on the ultra-fast time scale of tens femtoseconds, comparable to the period of the corresponding lattice vibrations. The dynamics are determined by a complex interplay of the particle-hole excitation over the gap and of the tunnelling through it, giving rise to the highly non-trivial time evolution which comprises high harmonics and reveals periodic reappearance of the gap. The time evolution is obtained by solving the dynamical mean-field theory equations with the realistic parameters for the system and radiation. Results are summarized in the phase diagram, helpful for a possible experimental setup to achieve a dynamical control over the conduction state of this and other materials with the similarly strong electron-phonon interaction.
@article{arxiv.2006.11791,
title = {Laser-induced ultrafast insulator-metal transition in $\text{BaBiO}_{3}$},
author = {Alexander E. Lukyanov and Vyacheslav D. Neverov and Yaroslav V. Zhumagulov and Alexey P. Menushenkov and Andrey V. Krasavin and Alexei Vagov},
journal= {arXiv preprint arXiv:2006.11791},
year = {2020}
}