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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Published in | Physical review letters Vol. 128; no. 18; p. 187402 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
06.05.2022
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Online Access | Get more information |
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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. |
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ISSN: | 1079-7114 |
DOI: | 10.1103/physrevlett.128.187402 |