Li, Xinwei and Ning, Honglie and Mehio, Omar and Zhao, Hengdi and Lee, Min-Cheol and Kim, Kyungwan and Nakamura, Fumihiko and Maeno, Yoshiteru and Cao, Gang and Hsieh, David (2022) Keldysh Space Control of Charge Dynamics in a Strongly Driven Mott Insulator. Physical Review Letters, 128 (18). Art. No. 187402. ISSN 0031-9007. doi:10.1103/physrevlett.128.187402. https://resolver.caltech.edu/CaltechAUTHORS:20220525-286273000
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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 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.
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| Additional Information: | © 2022 American Physical Society. (Received 24 October 2021; revised 20 February 2022; accepted 11 April 2022; published 6 May 2022) We thank Swati Chaudhary, Nicolas Tancogne-Dejean, and Tae Won Noh for useful discussions. The first-principles calculations in this work were performed using the quantum espresso package. Time-resolved spectroscopic measurements were supported by the Institute for Quantum Information and Matter (IQIM), a NSF Physics Frontiers Center (PHY-1733907). D. H. also acknowledges support for instrumentation from the David and Lucile Packard Foundation and from ARO MURI Grant No. W911NF-16-1-0361. X. L. acknowledges support from the Caltech Postdoctoral Prize Fellowship and the IQIM. G. C. acknowledges NSF support via Grant No. DMR 1903888. M.-C. L. acknowledges funding supports from the Research Center Program of IBS (Institute for Basic Science) in Korea (IBS-R009-D1). K. K. was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2020R1A2C3013454). Y. M. was supported by the JSPS Core-to-Core Program No. JPJSCCA20170002 as well as the JSPS Kakenhi No. JP17H06136. | ||||||||||||||||||||||
| Group: | Institute for Quantum Information and Matter | ||||||||||||||||||||||
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| Issue or Number: | 18 | ||||||||||||||||||||||
| DOI: | 10.1103/physrevlett.128.187402 | ||||||||||||||||||||||
| Record Number: | CaltechAUTHORS:20220525-286273000 | ||||||||||||||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20220525-286273000 | ||||||||||||||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||||||||
| ID Code: | 114906 | ||||||||||||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||||||||||||
| Deposited By: | George Porter | ||||||||||||||||||||||
| Deposited On: | 31 May 2022 20:12 | ||||||||||||||||||||||
| Last Modified: | 31 May 2022 20:12 |
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