| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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High-Pressure Ultrafast Dynamics in Sr$_{2}$IrO$_{4}$: Pressure-Induced Phonon Bottleneck Effect |
| Yanling Wu1†, Xia Yin2†, Jiazila Hasaien1,3, Yang Ding2**, Jimin Zhao1,3,4** |
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190
2Center for High-Pressure Sciences and Technology Advanced Research, Beijing 100094
3School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049
4Songshan Lake Materials Laboratory, Dongguan 523808
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| Cite this article: |
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Yanling Wu, Xia Yin, Jiazila Hasaien et al 2020 Chin. Phys. Lett. 37 047801 |
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Abstract By integrating pump-probe ultrafast spectroscopy with diamond anvil cell (DAC) technique, we demonstrate a time-resolved ultrafast dynamics study on non-equilibrium quasiparticle (QP) states in Sr$_{2}$IrO$_{4}$ under high pressure. On-site in situ condition is realized, where both the sample and DAC have fixed position during the experiment. The QP dynamics exhibits a salient pressure-induced phonon bottleneck feature at 20 GPa, which corresponds to a gap shrinkage in the electronic structure. A structural transition is also observed at 32 GPa. In addition, the slowest relaxation component reveals possible heat diffusion or pressure-controlled local spin fluctuation associated with the gap shrinkage. Our work enables precise pressure dependence investigations of ultrafast dynamics, paving the way for reliable studies of high-pressure excited state physics.
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Received: 13 February 2020
Published: 24 March 2020
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| PACS: |
78.47.J-
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(Ultrafast spectroscopy (<1 psec))
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78.47.jg
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(Time resolved reflection spectroscopy)
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62.50.-p
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(High-pressure effects in solids and liquids)
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71.38.-k
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(Polarons and electron-phonon interactions)
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| Fund: Supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0303603, 2016YFA0300303, 2018YFA0305703), the National Natural Science Foundation of China (Grant Nos. 11774408, 11574383, 11874075, U1530402), the Strategic Priority Research Program of CAS (Grant No. XDB30000000), the International Partnership Program of Chinese Academy of Sciences (Grant Nos. GJHZ1826, GJHZ1403), the Beijing Natural Science Foundation (Grant No. 4191003), the Science Challenge Project (Grant No. TZ2016001), and the CAS Interdisciplinary Innovation Team. |
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