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 CaRuO. 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.
Keywords
Cite
@article{arxiv.2205.05172,
title = {Keldysh space control of charge dynamics in a strongly driven Mott insulator},
author = {Xinwei Li and Honglie Ning and Omar Mehio and Hengdi Zhao and Min-Cheol Lee and Kyungwan Kim and Fumihiko Nakamura and Yoshiteru Maeno and Gang Cao and David Hsieh},
journal= {arXiv preprint arXiv:2205.05172},
year = {2022}
}
Comments
6 pages main text, 4 figures, 16 pages supplementary information