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Time-domain femtosecond laser spectroscopic measurements of the ultrafastlattice dynamics in 2H-MoTe2 bulk crystals were carried out to understand thecarrier-phonon interactions that govern electronic transport properties. Anunusually long lifetime coherent A1g phonon mode was observed even in thepresence of very large density of photo-excited carriers at room temperature.The decay rate was observed to decrease with increasing excitation laserfluence. Based on the laser fluence dependence including the inducement ofsignificant phonon softening and a peculiar decrease in phonon decay rate, weattribute the long lifetime lattice dynamics to weak anharmonic phonon-phononcoupling and a carrier-density-dependent deformation potential electron-phononcoupling.

Ultrafast Dynamics of Electron-phonon Coupling in Transition-metal Dichalcogenides