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Special Issue:
SPECIAL TOPIC — States and new effects in nonequilibrium
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| SPECIAL TOPIC—States and new effects in nonequilibrium |
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Ultrafast dynamics in photo-excited Mott insulator Sr3Ir2O7 at high pressure |
| Xia Yin(尹霞)1, Jianbo Zhang(张建波)1, Wang Dong(王东)1, Takeshi Nakagawa1, Chunsheng Xia(夏春生)1, Caoshun Zhang(张曹顺)1, Weicheng Guo(郭伟程)1, Jun Chang(昌峻)2,‡, and Yang Ding(丁阳)1,† |
1 Center for High-Pressure Science and Technology Advanced Research, Beijing 100094, China;
2 College of Physics and Information Technology, Shaanxi Normal University, Xi'an 710119, China |
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Abstract High-pressure ultrafast dynamics, as a new crossed research direction, are sensitive to subtle non-equilibrium state changes that might be unresolved by equilibrium states measurements, providing crucial information for studying delicate phase transitions caused by complex interactions in Mott insulators. With time-resolved transient reflectivity measurements, we identified the new phases in the spin—orbit Mott insulator Sr3Ir2O7 at 300 K that was previously unidentified using conventional approaches such as x-ray diffraction. Significant pressure-dependent variation of the amplitude and lifetime obtained by fitting the reflectivity ΔR/R reveal the changes of electronic structure caused by lattice distortions, and reflect the critical phenomena of phase transitions. Our findings demonstrate the importance of ultrafast nonequilibrium dynamics under extreme conditions for understanding the phase transition of Mott insulators.
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Received: 26 May 2023
Revised: 08 June 2023
Accepted manuscript online: 08 June 2023
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PACS:
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61.82.Ms
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(Insulators)
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63.20.kd
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(Phonon-electron interactions)
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64.60.F-
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(Equilibrium properties near critical points, critical exponents)
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| Fund: The project supported by the National Key Research and Development Program of China (Grant No. 2018YFA0305703), Science Challenge Project (Grant No. TZ2016001), and the National Natural Science Foundation of China (Grant Nos. U1930401 and 11874075). |
Corresponding Authors:
Yang Ding, Jun Chang
E-mail: yang.ding@hpstar.ac.cn;junchang@snnu.edu.cn
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Cite this article:
Xia Yin(尹霞), Jianbo Zhang(张建波), Wang Dong(王东), Takeshi Nakagawa, Chunsheng Xia(夏春生), Caoshun Zhang(张曹顺), Weicheng Guo(郭伟程), Jun Chang(昌峻), and Yang Ding(丁阳) Ultrafast dynamics in photo-excited Mott insulator Sr3Ir2O7 at high pressure 2024 Chin. Phys. B 33 016103
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