Journal
CHINESE PHYSICS LETTERS
Volume 37, Issue 4, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0256-307X/37/4/047801
Keywords
78; 47; J-; 78; 47; jg; 62; 50; -p; 71; 38; -k
Categories
Funding
- National Key Research and Development Program of China [2017YFA0303603, 2016YFA0300303, 2018YFA0305703]
- National Natural Science Foundation of China [11774408, 11574383, 11874075, U1530402]
- Strategic Priority Research Program of CAS [XDB30000000]
- International Partnership Program of Chinese Academy of Sciences [GJHZ1826, GJHZ1403]
- Beijing Natural Science Foundation [4191003]
- Science Challenge Project [TZ2016001]
- CAS Interdisciplinary Innovation Team
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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 Sr2IrO4 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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