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MON: Monday Contributed Sessions

MON 23: Poster Session: Fundamental Aspects and Model Systems

MON 23.49: Poster

Monday, September 8, 2025, 18:30–20:30, ZHG Foyer 1. OG

Probing Ultrafast Lattice Dynamics of Quantum Material Surfaces — •Alp Akbiyik¹, Felix Kurtz¹, Hannes Böckmann¹, and Claus Ropers^1,2 — ¹Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany — ²4th Physical Institute, University of Göttingen, Germany

Correlated phenomena among quantum materials have attracted considerable interest in recent decades. However, their potential applications require a better understanding of and ability to manipulate the lattice dynamics coupled to electronic phenomena. Ultrafast LEED probes the surfaces of bulk or two-dimensional materials to observe structural phase transitions and lattice thermalization with a time resolution down to 1 ps [1]. While some bulk CDW systems, such as TaS2 and TiSe2 have been studied extensively in ULEED, our ongoing studies focus more on mono- and few-layer van der Waals (vdW) materials to investigate intriguing phonon dynamics and novel structural changes owing to dimensionality effect.

[1] G. Storeck et al., Structural Dynamics 7, 034304 (2020).

Keywords: ultrafast dynamics; structural phase transitions; 2D materials