Phonon dynamics of a bulk WSe$_2$ crystal excited by ultrashort near-infrared pulses
Itsuki Kasai, Itsuki Takagi, and Kazutaka G. Nakamura
TL;DR
This study investigates the phonon dynamics in a bulk WSe$_2$ crystal using ultrashort near-infrared pulses, combining experimental pump-probe measurements with simulations to analyze vibrational modes.
Contribution
It provides a detailed analysis of phonon oscillations in WSe$_2$ with experimental and simulation data, identifying specific vibrational frequencies.
Findings
Oscillations at 7.45, 7.49, and 7.7 THz are well reproduced by simulations.
Fourier spectrum shows peaks at 4.0, 7.5, and 11.5 THz.
Experimental data aligns with simulated phonon modes.
Abstract
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 in simulations superimposing three oscillations (7.45, 7.49 and 7.7 THz) with different phases. The Fourier transform spectrum features small peaks at 4.0 and 11.5 THz along with intense peaks at around 7.5 THz.
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