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

Article

关键词: CHARGE-DENSITY-WAVE;    FERMI-SURFACE;    TRANSITION;   

DOI  :  10.1103/PhysRevB.103.L241108

来源: SCIE

【 摘 要 】

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.

【 授权许可】

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