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High-Pressure Ultrafast Dynamics in Sr2IrO4: Pressure-Induced Phonon Bottleneck Effect.
- Source :
-
Chinese Physics Letters . Apr2020, Vol. 37 Issue 4, p1-6. 6p. - Publication Year :
- 2020
-
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 Sr2IrO4under 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PHONONS
*DIAMOND anvil cell
*EXCITED states
*ELECTRONIC structure
Subjects
Details
- Language :
- English
- ISSN :
- 0256307X
- Volume :
- 37
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Chinese Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 152165971
- Full Text :
- https://doi.org/10.1088/0256-307X/37/4/047801