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

Paulina Majchrzak, Sahar Pakdel, Deepnarayan Biswas, Alfred J.H. Jones, Klara Volckaert, Igor Marković, Federico Andreatta, Raman Sankar, Chris Jozwiak, Eli Rotenberg, Aaron Bostwick, Charlotte E. Sanders, Yu Zhang, Gabriel Karras, Richard T. Chapman, Adam Wyatt, Emma Springate, Jill A. Miwa, Philip Hofmann, Phil D.C. KingNicola Lanatà, Young Jun Chang, Søren Ulstrup

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

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-VSe2. 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.

Original languageEnglish
Article numberL241108
JournalPhysical Review B
Volume103
Issue number24
DOIs
StatePublished - 15 Jun 2021

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