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

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Title
Keldysh Space Control of Charge Dynamics in a Strongly Driven Mott Insulator
Author(s)
Li, Xinwei; Ning, Honglie; Mehio, Omar; Zhao, Hengdi; Min-Cheol Lee; Kim, Kyungwan; Nakamura, Fumihiko; Maeno, Yoshiteru; Cao, Gang; Hsieh, David
Publication Date
2022-05
Journal
Physical Review Letters, v.128, no.18
Publisher
American Physical Society
Abstract
© 2022 American Physical Society.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 Ca2RuO4. 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.
URI
https://pr.ibs.re.kr/handle/8788114/11709
DOI
10.1103/PhysRevLett.128.187402
ISSN
0031-9007
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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