Keldysh Space Control of Charge Dynamics in a Strongly Driven Mott Insulator

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_...

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Bibliographic Details
Published in:Physical review letters 2022-05, Vol.128 (18), p.187402-187402, Article 187402
Main Authors: Li, Xinwei, Ning, Honglie, Mehio, Omar, Zhao, Hengdi, Lee, Min-Cheol, Kim, Kyungwan, Nakamura, Fumihiko, Maeno, Yoshiteru, Cao, Gang, Hsieh, David
Format: Article
Language:English
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Summary: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-fs pump pulse duration. By sweeping the electric field amplitude, we demonstrate continuous bandwidth tuning and a Keldysh crossover from a multiphoton 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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.128.187402