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Journal Article

Switching of the electron-phonon interaction in 1T-VSe2 assisted by hot carriers


Marković,  Igor
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Majchrzak, P., Pakdel, S., Biswas, D., Jones, A. J. H., Volckaert, K., Marković, I., et al. (2021). Switching of the electron-phonon interaction in 1T-VSe2 assisted by hot carriers. Physical Review B, 103(24): L241108, pp. 1-6. doi:10.1103/PhysRevB.103.L241108.

Cite as: https://hdl.handle.net/21.11116/0000-0008-E933-8
We apply an intense infrared laser pulse in order to perturb the electronic and vibrational states in the three-dimensional charge density wave material 1T-VSe 2. Ultrafast snapshots of the light-induced hot carrier dynamics and nonequilibrium quasiparticle spectral function are collected using time- and angle-resolved photoemission spectroscopy. The hot carrier temperature and time-dependent electronic self-energy are extracted from the time-dependent spectral function, revealing that incoherent electron-phonon interactions heat the lattice above the charge density wave critical temperature on a timescale of (200 +/- 40) fs. Density functional perturbation theory calculations establish that the presence of hot carriers alters the overall phonon dispersion and quenches efficient low-energy acoustic phonon scattering channels, which results in a new quasiequilibrium state that is experimentally observed.