Berlin 2024 – scientific programme
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O: Fachverband Oberflächenphysik
O 36: Poster: Ultrafast Electron Dynamics at Surfaces and Interfaces
O 36.13: Poster
Tuesday, March 19, 2024, 18:00–20:00, Poster C
Ultrafast Low Energy Electron Diffraction of Layered Materials — •Alp Akbiyik1, Felix Kurtz1, Monica Kolek Martinez de Azagra2, Lukas Jehn1, Hannes Böckmann1, Dennis Epp1, Thomas Weitz2, and Claus Ropers1,3 — 1Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany — 21st Physical Institute, University of Göttingen, Germany — 34th Physical Institute, University of Göttingen, Germany
Enhanced by reduced dimensionality and the formation of heterostructures, van-der-Waals materials including few-layer graphene and transition metal dichalcogenides exhibit a large variety of tunable and correlated phenomena. Studying the non-equilibrium response of such materials, ultrafast surface-sensitive measurement techniques such as angle-resolved photoemission spectroscopy is instrumental in revealing couplings and correlations in the time domain. As a complementary method for surface-sensitive structural dynamics, we employ ultrafast low-energy electron diffraction (ULEED) [1]. In this contribution, we present recent progress in the development and application of this technique for the study of structural phase transformations and lattice thermalization. Moreover, we will discuss progress towards higher versatility of the approach in studying exfoliated samples prepared and transferred in an argon atmosphere.
[1] G. Storeck et al., Structural Dynamics 7, 034304 (2020).
Keywords: ultrafast low energy electron diffraction; charge density waves; van der Waals materials; structural phase transitions; non-equilibrium dynamics