Ultrafast dynamics in photo-excited Mott insulator Sr3Ir2O7 at high pressure

doi:10.1088/1674-1056/acdc8c

中国物理B ›› 2024, Vol. 33 ›› Issue (1): 16103-16103.doi: 10.1088/1674-1056/acdc8c

所属专题： SPECIAL TOPIC — States and new effects in nonequilibrium

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

收稿日期:2023-05-26 修回日期:2023-06-08 接受日期:2023-06-08 出版日期:2023-12-13 发布日期:2023-12-20
通讯作者: Yang Ding, Jun Chang E-mail:yang.ding@hpstar.ac.cn;junchang@snnu.edu.cn
基金资助:
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).

Ultrafast dynamics in photo-excited Mott insulator Sr₃Ir₂O₇ at high pressure

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

Received:2023-05-26 Revised:2023-06-08 Accepted:2023-06-08 Online:2023-12-13 Published:2023-12-20
Contact: Yang Ding, Jun Chang E-mail:yang.ding@hpstar.ac.cn;junchang@snnu.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: ultrafast dynamics, high pressure, phase transition, Mott insulator

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.

Key words: ultrafast dynamics, high pressure, phase transition, Mott insulator

中图分类号: (Insulators)

61.82.Ms

63.20.kd (Phonon-electron interactions) 64.60.F- (Equilibrium properties near critical points, critical exponents)

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[J]. 中国物理B, 2024, 33(1): 16103-16103.

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Ultrafast dynamics in photo-excited Mott insulator Sr₃Ir₂O₇ at high pressure

Ultrafast dynamics in photo-excited Mott insulator Sr₃Ir₂O₇ at high pressure

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