SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 34: Ultrafast Electron Dynamics at Surface and Interfaces III
O 34.8: Vortrag
Dienstag, 28. März 2023, 12:30–12:45, TRE Phy
Non-equilibrium dynamics of bulk VSe2 — •Wibke Bronsch1, Manuel Tuniz2, Denny Puntel2, Alessandro Giammarino2, Fulvio Parmigiani1,2, and Federico Cilento1 — 1Elettra-Sincrotrone Trieste, Trieste, Italy — 2Università degli Studi di Trieste, Trieste, Italy
By means of time- and angle-resolved photoemission spectroscopy (tr-ARPES), we investigate the effect of optical excitation on the electronic properties of the transition metal dichalcogenide VSe2. The electronic band structure of VSe2 has recently been subject of investigation ranging from the bulk to the monolayer regime, in search for the manifestation of the opening of a band gap in its CDW phase [1,2]. However, at present, only a few studies on the effect of an ultrafast optical excitation are available [1,3]. In our contribution we present a study on the bulk material. By selecting the polarization of the probe pulses, tr-ARPES allows us to disentangle states with different orbital character, originating from the V and Se valence bands. Our tr-ARPES data show indication for a novel photoinduced state near the Fermi level, lasting for several picoseconds after photoexcitation.
[1] Biswas et al., Nano Letters 21, 1968-1975 (2021).
[2] Umemoto et al., Nano Research 12, 165-169 (2019).
[3] P. Majchrzak et al., Phys. Rev. B 103, L241108 (2021).