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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 Majchrzak^1,2, 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 Ulstrup¹ — ¹Department 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.