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Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 58: Poster Session - Ultrafast Electron Dynamics at Surface and Interfaces

O 58.4: Poster

Dienstag, 17. März 2020, 18:15–20:00, P2/2OG

Ultrafast electronic heating and interband dynamics in bulk 1T-VSe2 — •Paulina Majchrzak1,2, Deepnarayan Biswas1, Alfred Jones1, Klara Volckaert1, Charlotte Sanders2, Igor Marković3, Byoung Ki Choi4, Federico Andreatta1, Raman Sankar5, Yu Zhang2, Gabriel Karras2, Richard Chapman2, Adam Wyatt2, Emma Springate2, Jill Miwa1, Philip Hofmann1, Phil King3, Young Jun Chang4, and Søren Ulstrup11Department of Physics and Astronomy, Aarhus University, DK — 2Central Laser Facility, Rutherford Appleton Laboratory, UK — 3School of Physics and Astronomy, University of St Andrews, UK — 4Department of Physics, University of Seoul, ROK — 5Institute of Physics, Academia Sinica, TW

Layered TMDCs are intensely studied model systems for understanding strongly-correlated materials. One such compound of interest is 1T-VSe2. In the bulk, it is metallic, and exhibits out-of-plane charge density wave (CDW) ordering. Its monolayer form, on the other hand, shows enhanced CDW transition temperature and perfect Fermi surface nesting. Here, we use TR-ARPES to trace out the response of the bulk VSe2 system to an optical excitation on femtosecond timescales. The (E,k,t)-dependent ARPES spectrum is simulated with a spectral function model incorporating bare bands obtained from DFT. As a result, the transient electronic heating and the interband dynamics in the Se- and V-derived states around the Fermi level are deconvolved. These findings lead to a more comprehensive understanding of the photoexcited behaviour in lesser-explored family of metallic TMDCs.

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