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
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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