Dresden 2026 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 66: 2D Materials: Electronic structure, excitations, etc. – Poster (joint session O/TT)

TT 66.21: Poster

Wednesday, March 11, 2026, 18:00–20:00, P2

Temperature-dependent VUV-ARPES of 1T-Mo_xTa_1−xS₂ — •Torben Petersen^1,2, Matthias Kalläne^1,2,3, Adina Timm^1,2, Tim Riedel^1,2, and Kai Rossnagel^1,2,3 — ¹Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany — ²Ruprecht Haensel Laboratory, Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany — ³Kiel Nano, Surface and Interface Science KiNSIS, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany

Examining the charge density wave (CDW) phase transitions of transition metal-substituted transition metal dichalcogenides (TMDCs) provides insight into tuning transition behavior by doping. To this end, we use the 1T-Mo_xTa_1−xS₂ reference system, comparing the pristine sample with two doped samples (x = 0.5% and x = 1%) using 11 eV laser-based VUV-ARPES. We investigate work function changes alongside doping-induced band structure changes in the temperature range of 60 K to 370 K. This allows us to observe the high- and low-temperature CDW phase transitions known from the pristine material and determine how the CDW-induced band structure changes vary with doping.

Keywords: TMDC; CDW; ARPES; Tantaldisulfid