journal article·2021-06-16Open access

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. King, Nicola Lanatà, Young Jun Chang, Søren Ulstrup

Physical Review B· Volume 103· Issue 24

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 $1T\text{\ensuremath{-}}{\mathrm{VSe}}2$. 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 $(200\ifmmode\pm\else\textpm\fi{}40)$ 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.
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Research context

OpenAlex topics: Phase-change materials and chalcogenides · Solid-state spectroscopy and crystallography · Advanced Thermoelectric Materials and Devices

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, 8000 Aarhus C, Denmark

Central Laser Facility, STFC Rutherford Appleton Laboratory, Harwell 0X11 0QX, United Kingdom

SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, United Kingdom

Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany

Institute of Physics, Academia Sinica, Taipei 11529, Taiwan, Republic of China

Advanced Light Source, E. O. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, 10691 Stockholm, Sweden

Department of Physics, University of Seoul, Seoul 02504, Republic of Korea

Department of Smart Cities, University of Seoul, Seoul, 02504, Republic of Korea

Funding

Villum Fonden · Natur og Univers, Det Frie Forskningsråd · Aarhus Universitets Forskningsfond · National Research Foundation of Korea · Royal Society · Leverhulme Trust · Ministry of Science and Technology, Taiwan · Science and Technology Facilities Council · U.S. Department of Energy

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