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arXiv · 2006.11791

Laser-induced ultrafast insulator-metal transition in $\text{BaBiO}_{3}$

Alexander E. Lukyanov·Vyacheslav D. Neverov·Yaroslav V. Zhumagulov·Alexey P. Menushenkov·Andrey V. Krasavin·Alexei Vagov
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Abstract

We investigate ultra-fast coherent quantum dynamics of undoped $\text{BaBiO}_{3}$ 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.

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Alexander E. Lukyanov, Vyacheslav D. Neverov, Yaroslav V. Zhumagulov, Alexey P. Menushenkov, Andrey V. Krasavin, Alexei Vagov. 2020-06-21. Laser-induced ultrafast insulator-metal transition in $\text{BaBiO}_{3}$. https://doi.org/10.1103/physrevresearch.2.043207

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