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Photoinduced coherent acoustic phonon dynamics inside Mott insulator Sr2IrO4 films observed by femtosecond X-ray pulses
Zhang BB(张兵兵); Zhang, BB; Wei X(魏旭); Sun DR(孙大睿); Jia QJ(贾全杰); Tao Y(陶冶); Liu, J; Wei, X; Sun, DR; Jia, QJ; Li, YL; Tao, Y
2017
Source PublicationAPPLIED PHYSICS LETTERS
ISSN0003-6951
EISSN1077-3118
Volume110Issue:15Pages:151904
SubtypeArticle
AbstractWe 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.
DOI10.1063/1.4980062
WOS KeywordLIGHT-INDUCED SUPERCONDUCTIVITY ; HIGH-TEMPERATURE
Indexed BySCI ; EI ; SCOPUS ; ADS
Language英语
WOS Research AreaPhysics
WOS SubjectPhysics, Applied
WOS IDWOS:000399689400013
EI Accession Number20171603587946
EI KeywordsDynamics - Electromagnetic wave emission - Electron-phonon interactions - Iridium compounds - Laser produced plasmas - Lattice vibrations - Perovskite - Photons - Plasma interactions - Strontium compounds - Structural dynamics - Thin films - Transient analysis - X ray diffraction
EI Classification Number408 Structural Design - 482.2 Minerals - 711 Electromagnetic Waves - 931.3 Atomic and Molecular Physics - 932.3 Plasma Physics - 933.1.1 Crystal Lattice
ADS Bibcode2017ApPhL.110o1904Z
ADS URLhttps://ui.adsabs.harvard.edu/abs/2017ApPhL.110o1904Z
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2017ApPhL.110o1904Z/citations
AXRIV CODE174
Citation statistics
Cited Times:2 [ADS]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/284725
Collection多学科研究中心
Affiliation中国科学院高能物理研究所
First Author AffilicationInstitute of High Energy
Recommended Citation
GB/T 7714
Zhang BB,Zhang, BB,Wei X,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 张兵兵.,Zhang, BB.,魏旭.,孙大睿.,贾全杰.,...&Tao, Y.(2017).Photoinduced coherent acoustic phonon dynamics inside Mott insulator Sr2IrO4 films observed by femtosecond X-ray pulses.APPLIED PHYSICS LETTERS,110(15),151904.
MLA 张兵兵,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.
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