Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 66: 2D Materials: Electronic structure, excitations, etc. – Poster (joint session O/TT)
TT 66.16: Poster
Mittwoch, 11. März 2026, 18:00–20:00, P2
Impact of Mo doping on the charge density wave in 1T-TaS2 studied by laser-ARPES and LEED — •Adina Timm1,2, Finja Schillmöller1,2, Florian K. Diekmann1,2, Jana Kähler1,2, Matthias Kalläne1,2,3, Tim Riedel1,2, and Kai Rossnagel1,2,3 — 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
Controlling charge density waves (CDWs) in quantum materials enables the fine-tuning of their electronic properties, paving the way for future electronic and optoelectronic devices. The layered compound 1T-TaS2 exhibits various temperature-dependent CDW phases that we aim to modify through doping. We introduced the dopant molybdenum during crystal growth via the chemical vapor transport method. Using 11-eV laser-based angle-resolved photoelectron spectroscopy (ARPES), we comparatively measured the electronic band structures of pristine and Mo-doped 1T-TaS2 crystals. Complementary low-energy electron diffraction (LEED) measurements revealed the structural rearrangements during the CDW transitions and partial CDW suppression at specific doping levels. Our results suggest that modest Mo doping allows for subtle adjustments to the CDW landscape of 1T-TaS2, yielding different transition temperatures while preserving the underlying electronic-structural order.
Keywords: Tantaldisulfid; CDW; TMDC; ARPES; LEED