Switching of the electron-phonon interaction in 1T-VSe2 assisted by hot carriers
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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 non-equilibrium 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 quasi-equilibrium state that is experimentally observed.
Majchrzak , P , Pakdel , S , Biswas , D , Jones , A J H , Volckaert , K , Marković , I , Andreatta , F , Sankar , R , Jozwiak , C , Rotenberg , E , Bostwick , A , Sanders , C E , Zhang , Y , Karras , G , Chapman , R T , Wyatt , A , Springate , E , Miwa , J A , Hofmann , P , King , P D C , Lanata , N , Chang , Y J & Ulstrup , S 2021 , ' Switching of the electron-phonon interaction in 1T-VSe 2 assisted by hot carriers ' , Physical Review. B, Condensed matter and materials physics , vol. 103 , no. 24 , L241108 . https://doi.org/10.1103/PhysRevB.103.L241108
Physical Review. B, Condensed matter and materials physics
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DescriptionFunding: We gratefully acknowledge funding from VILLUM FONDEN through the Young Investigator Program (Grant. No.15375) and the Centre of Excellence for Dirac Materials (Grant. No. 11744), the Danish Council for Independent Research, Natural Sciences under the Sapere Aude program (Grant Nos. DFF-9064-00057B and DFF-6108-00409) and the Aarhus University Research Foundation. This work is also supported by National Research Foundation (NRF) grants funded by the Korean government (nos. NRF-2020R1A2C200373211 and 2019K1A3A7A09033389) and by the International MaxPlanck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM). The authors also acknowledge The Royal Society and The Leverhulme Trust. R.S acknowledges financial support provided by the Ministry of Science and Technology in Taiwan under project number MOST-108-2112-M-001-049-MY2 & MOST 109-2124-M-002-001 and Sinica funded i-MATE financial Support AS-iMATE-109-13. Access to the Artemis Facility was funded by STFC. The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
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