Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 7: 2D Materials: Electronic structure, excitations, etc. I (joint session O/HL/TT)
O 7.6: Vortrag
Montag, 9. März 2026, 12:00–12:15, TRE/MATH
Engineering sulfur vacancy dimers in monolayer WS2 — •Daniel Jansen1, Guangyao Miao1, Jan Keienburg1, Jeison Fischer1, Thomas Michely1, Hannu-Pekka Komsa2, and Wouter Jolie1 — 1Institute of Physics II, University of Cologne, Cologne, Germany — 2Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu, Finland
Sulfur vacancies [1] and sulfur vacancy dimers in nearest-neighbor distance [2] in monolayer WS2 have been experimentally proven to yield bright and stable photon emission, thus holding promises for the development of quantum technologies.
Here we investigate dimers of sulfur vacancies in different configurations in monolayer WS2 created with the tip of a scanning tunneling microscope [3]. Scanning tunneling spectroscopy reveals strong hybridization of the sulfur vacancy electronic in-gap states, validated by density functional theory calculations. For dimers in nearest-neighbor configuration we find that inelastically tunneling electrons can induce sulfur atom migration, resulting in a rotary motion of the dimer. This motion is studied in detail by analyzing the emerging telegraph noise in the junction. Lastly, we elaborate on scenarios to make use of the dimer motion for the design of vacancy structures and lattices.
[1] Schuler et al., Sci. Adv. 6, 38 (2020)
[2] Sun et al., Nature Commun. 15, 9476 (2024)
[3] Jansen et al., Phys. Rev. B 109, 195430 (2024)
Keywords: point defect; color center; scanning tunneling microscopy; 2D material; WS2