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TT: Fachverband Tiefe Temperaturen
TT 16: 2D Materials beyond graphene: Growth, structure and substrate interaction (joint session O/HL/TT)
TT 16.3: Vortrag
Montag, 9. März 2026, 15:30–15:45, HSZ/0204
Rise and fall of 1T-TaS2: Epitaxial growth of monolayer TaS2 on Au(111) — •Lars Buß1, Cathy Sulaiman1, Raquel Sánchez-Barquilla1, Iulia Cojocariu2, Marcin Szpytma3, Tevfik Onur Menteş2, Andrea Locatelli2, Jens Falta4, and Jan Ingo Flege1 — 1Applied Physics and Semiconductor Spectroscopy, BTU Cottbus-Senftenberg, Cottbus, Germany — 2Elettra-Sincrotrone Trieste S.C.p.A, Basovizza, Trieste, Italy — 3Faculty of Physics and Applied Computer Science, AGH University of Krakow, Poland — 4Institute of Solid State Physics, University of Bremen, Germany
Two-dimensional TaS2 has attracted extensive research interest due to its ability to exhibit electron correlation effects, including charge density waves (CDWs). In particular, 1T-TaS2 is of interest as it shows a CDW at room temperature. However, when grown on metal substrates, only 2H-TaS2 has been reported. To elucidate the reasons for the apparent lack of 1T-TaS2 growth in the literature, we have investigated the growth of TaS2 on Au(111) employing in situ low-energy electron microscopy (LEEM) and micro-diffraction (µLEED) as well as X-ray photoemission electron microscopy (XPEEM) [1]. We show that at elevated temperatures TaS2 nucleates and grows in the metastable 1T-TaS2 phase, which transforms into the stable 2H-TaS2 phase via a temperature-activated process and then continues to grow at a considerably lower rate. Furthermore, we observe CDW-like ordering in 1T-TaS2/Au(111), though it is suppressed in 2H-TaS2/Au(111).
[1] L. Buß et al. Phys. Rev. Materials 9, 074006 (2025).
Keywords: TMDs; Charge Density Waves; LEEM; LEED; XPEEM