Photoinduced coherent acoustic phonon dynamics inside Mott insulator Sr2IrO4 films observed by femtosecond X-ray pulses
文献类型：期刊论文
| 作者 | Sun DR(孙大睿) ; Wei X(魏旭); Zhang, BB; Zhang BB(张兵兵); Liu, J; Tao Y(陶冶); Jia QJ(贾全杰); Tao, Y; Li, YL; Jia, QJ
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| 刊名 | APPLIED PHYSICS LETTERS
 |
| 出版日期 | 2017 |
| 卷号 | 110期号:15页码:151904 |
| ISSN号 | 0003-6951 |
| DOI | 10.1063/1.4980062 |
| 文献子类 | Article |
| 英文摘要 | We investigate the transient photoexcited lattice dynamics in a layered perovskite Mott insulator Sr2IrO4 film by femtosecond X-ray diffraction using a laser plasma-based X-ray source. The ultrafast structural dynamics of Sr2IrO4 thin films are determined by observing the shift and broadening of (0012) Bragg diffraction after excitation by 1.5 eV and 3.0 eV pump photons for films with different thicknesses. The observed transient lattice response can be well interpreted as a distinct three-step dynamics due to the propagation of coherent acoustic phonons generated by photoinduced quasiparticles (QPs). Employing a normalized phonon propagation model, we found that the photoinduced angular shifts of the Bragg peak collapse into a universal curve after introducing normalized coordinates to account for different thicknesses and pump photon energies, pinpointing the origin of the lattice distortion and its early evolution. In addition, a transient photocurrent measurement indicates that the photoinduced QPs are charge neutral excitons. Mapping the phonon propagation and correlating its dynamics with the QP by ultrafast X-ray diffraction (UXRD) establish a powerful way to study electron-phonon coupling and uncover the exotic physics in strongly correlated systems under nonequilibrium conditions. Published by AIP Publishing. |
| 电子版国际标准刊号 | 1077-3118 |
| WOS关键词 | LIGHT-INDUCED SUPERCONDUCTIVITY ; HIGH-TEMPERATURE |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000399689400013 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/284725]  |
| 专题 | 高能物理研究所_多学科研究中心 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | Sun DR,Wei X,Zhang, BB,et al. Photoinduced coherent acoustic phonon dynamics inside Mott insulator Sr2IrO4 films observed by femtosecond X-ray pulses[J]. APPLIED PHYSICS LETTERS,2017,110(15):151904. |
| APA | 孙大睿.,魏旭.,Zhang, BB.,张兵兵.,Liu, J.,...&Wei, X.(2017).Photoinduced coherent acoustic phonon dynamics inside Mott insulator Sr2IrO4 films observed by femtosecond X-ray pulses.APPLIED PHYSICS LETTERS,110(15),151904. |
| MLA | 孙大睿,et al."Photoinduced coherent acoustic phonon dynamics inside Mott insulator Sr2IrO4 films observed by femtosecond X-ray pulses".APPLIED PHYSICS LETTERS 110.15(2017):151904. |
入库方式： OAI收割
来源：高能物理研究所
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