Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 29: Poster: 2D Materials

O 29.22: Poster

Tuesday, March 19, 2024, 12:30–14:30, Poster A

Linear and circular dichroism ARPES of the charge density wave material TiSe₂ — •Hibiki Orio¹, Maximilian Ünzelmann¹, Jakub Schusser¹, Kai Rossnagel^2,3, and Friedrich Reinert¹ — ¹Universität Würzburg, Experimentelle Physik VII and Würzburg-Dresden Cluster of Excellence, Würzburg, Germany — ²Deutsches Elektronen Synchrotron DESY, Hamburg, Germany — ³IEAP and KiNSIS, CAU Kiel, Kiel, Germany

The transition metal dichalcogenide compound TiSe₂ transforms into a 2 × 2 × 2 charge density wave (CDW) phase below 200K. The physical process governing the buildup of the CDW has been controversial. To understand the nature of this intriguing property, the hybridized orbital character involved in the CDW gap formation is crucial information. Recent studies show that linear- and circular dichroism (LD and CD) in angle-resolved photoelectron spectroscopy (ARPES) provides insights into the orbital texture of the initial states. Here, using ARPES in the soft x-ray photon energy range, we systematically study the LD and CD of TiSe₂ in both the semimetallic and CDW phases.

Keywords: Charge density wave; ARPES; Dichroism; TMDC