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We apply an intense infrared laser pulse in order to perturb the electronicand vibrational states in the three-dimensional charge density wave material1$T$-VSe$_2$. Ultrafast snapshots of the light-induced hot carrier dynamics andnon-equilibrium quasiparticle spectral function are collected using time- andangle-resolved photoemission spectroscopy. The hot carrier temperature andtime-dependent electronic self-energy are extracted from the time-dependentspectral function, revealing that incoherent electron-phonon interactions heatthe lattice above the charge density wave critical temperature on a timescaleof $(200 \pm 40)$~fs. Density functional perturbation theory calculationsestablish that the presence of hot carriers alters the overall phonondispersion and quenches efficient low-energy acoustic phonon scatteringchannels, which results in a new quasi-equilibrium state that is experimentallyobserved.

Hot carrier-assisted switching of the electron-phonon interaction in 1$T$-VSe$_2$