Keldysh space control of charge dynamics in a strongly driven Mott insulator

Abstract

The fate of a Mott insulator under strong low frequency optical driving conditions is a fundamental problem in quantum many-body dynamics. Using ultrafast broadband optical spectroscopy, we measured the transient electronic structure and charge dynamics of an off-resonantly pumped Mott insulator Ca${}_2$RuO${}_4$. We observe coherent bandwidth renormalization and nonlinear doublon-holon pair production occurring in rapid succession within a sub-100 femtosecond pump pulse duration. By sweeping the electric field amplitude, we demonstrate continuous bandwidth tuning and a Keldysh cross-over from a multi-photon absorption to quantum tunneling dominated pair production regime. Our results provide a procedure to control coherent and nonlinear heating processes in Mott insulators, facilitating the discovery of novel out-of-equilibrium phenomena in strongly correlated systems.

arXiv comment6 pages main text, 4 figures, 16 pages supplementary information

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• Distinguishing and controlling Mottness in 1T-TaS${}_2$ by ultrafast light
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• Time-hidden magnetic order in a multi-orbital Mott insulator
• Exciton-assisted low-energy magnetic excitations in a photoexcited Mott insulator on a square lattice
• Charge creation via quantum tunneling in one-dimensional Mott insulators: A numerical study of the extended Hubbard model
• Problem of nonlinear conductivity within relaxation time approximation in noncentrosymmetric insulators
• High Harmonic Tracking of Ultrafast Electron Dynamics across the Mott to Charge Density Wave Phase Transition
• Many-body Keldysh Crossover in the DC-driven Haldane Spin Chain
• Geometric Effects on Tunneling in Driven Quantum Systems