Photoinduced coherent acoustic phonon dynamics inside Mott insulator Sr2IrO4 films observed by femtosecond X-ray pulses

Zhang, Bing-Bing; Liu, Jian; Wei, Xu; Sun, Da-Rui; Jia, Quan-Jie; Li, Yuelin; Tao, Ye

doi:10.1063/1.4980062

Title: Photoinduced coherent acoustic phonon dynamics inside Mott insulator Sr₂IrO₄ films observed by femtosecond X-ray pulses

Journal Article · Thu Apr 13 00:00:00 EDT 2017 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4980062· OSTI ID:1360146

^[1]; Liu, Jian ^[2]; Wei, Xu ^[1]; Sun, Da-Rui ^[1];

^[1]; Li, Yuelin ^[3];

^[1]

Chinese Academy of Sciences (CAS), Beijing (China). Inst. of High Energy Physics (IHEP)
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division

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 normalizedn coordinates to account for different thicknesses and pump photon energies, pinpointing the origin of the lattice distortion and its early evolution. In addition, we report 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.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: AC02-06CH11357; U1332205

OSTI ID:: 1360146

Journal Information:: Applied Physics Letters, Vol. 110, Issue 15; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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