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Hokkaido University Collection of Scholarly and Academic Papers >
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Ultrafast dynamics of Mott-state quench and formation in strongly correlated BEDT-TTF molecular conductors observed by three-pulse pump probe spectroscopy
| Title: | Ultrafast dynamics of Mott-state quench and formation in strongly correlated BEDT-TTF molecular conductors observed by three-pulse pump probe spectroscopy |
| Authors: | Tsuchiya, S. Browse this author | | Taniguchi, H. Browse this author | | Yamada, J. Browse this author | | Toda, Y. Browse this author →KAKEN DB | | Mihailovic, D. Browse this author | | Mertelj, T. Browse this author |
| Issue Date: | 24-Sep-2021 |
| Publisher: | American Physical Society (APS) |
| Journal Title: | Physical Review B |
| Volume: | 104 |
| Issue: | 11 |
| Start Page: | 115152 |
| Publisher DOI: | 10.1103/PhysRevB.104.115152 |
| Abstract: | We investigate the quench and real-time formation of the Mott state and photoexcited carrier relaxation dynamics in the Mott insulator kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Cl(kappa-Cl) and the superconductor kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br(kappa -Br) using three-pulse femtosecond optical spectroscopy, where BEDT-TTF is bis(ethylenedithio)tetrathiafulvalene. In both salts, we find that transient reflectivity amplitude gradually recovers with time after strong near-infrared pulse quench, but its relaxation time is nearly constant throughout. This indicates that in K-Cl, the energy gap for charge excitations is filled rather than closed by photoinduced carriers of only similar to 0.5% per dimer. The Mott state is re-formed on a few-picosecond timescale with the disappearance of the in-gap photodoping-induced states near the Fermi energy. In kappa-Br, a behavior similar to that in kappa-Cl is observed and attributed to the disorder-induced phase-separated Mott insulating regions. |
| Rights: | Copyright (2021) by The American Physical Society. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/83250 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 土屋 聡
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