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cond-mat.mtrl-sci2025
Phonon dynamics of a bulk WSe crystal excited by ultrashort near-infrared pulses
Itsuki Kasai, Itsuki Takagi, Kazutaka G. Nakamura
Pump-probe reflectivity measurements have been performed on a single crystal of tungsten diselenide (WSe) using ultrashort near-infrared pulses. The behavior is well reproduced…
cond-mat.mtrl-sci2024
Dual role of longitudinal optical phonons for generation of coherent oscillations in gallium arsenide under optical pumping
Itsuki Takagi, Yuma Konno, Yosuke Kayanuma +1
We present a novel and simple picture of the generation dynamics of coherent longitudinal optical (LO) phonons and LO-phonon-plasmon-coupled (LOPC) modes by the ultrafast infrared…