Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 71: 2D Materials: Electronic structure, excitations, etc. – Poster (joint session O/TT)
O 71.10: Poster
Mittwoch, 11. März 2026, 18:00–20:00, P2
Exciton and trion dynamics of 2D transition metal dichalcogenides — •Seawoo Moon1, Alessandro De Vita1, Lawson T. Lloyd2, Tania Mukherjee1, Anh T. Nguyen3, Dong-Wook Kim3, Martin Wolf2, Ralph Ernstorfer1,2, and Tommaso Pincelli1 — 1Institute for Physics and Astronomy, TU Berlin, Germany — 2Fritz Haber Institute of the Max Planck Society, Germany — 3Department of Physics, Ewha Womans University, South Korea
Key functionalities of transition metal dichalcogenides (TMDs) are determined by excitons whose behaviour can be tweaked by interface–induced external perturbation such as proximity effects, charge transfer and local electromagnetic fields. Excitonic behaviors and band alignment of TMDs with interfacing materials are explored. We studied the band alignment of monolayer WS2 on nanostructured Ag by Kelvin probe force microscope, a tool that can map electrical potential of sample surface. By this method, the exciton–to–trion conversion mechanisms in WS2 could be explained, including the role of the localized surface plasmons. For a more direct approach, time and angle–resolved photoemission spectroscopy (TrARPES) with pump–probe technique is employed to directly map the equilibrium and non–equilibrium electronic structure of TMD–metal and TMD/TMD interfaces. In–situ and ex–situ techniques are required to achieve pristine TMD surfaces and interfaces, since TrARPES is a highly surface sensitive technique.
Keywords: Transition Metal Dichalcogenides (TMDs); Excitons; Kelvin Probe Force Microscopy (KPFM); Angle--resolved Photoemission Spectroscopy (ARPES)