Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 98: Ultrafast electron dynamics at surface and interfaces IV
O 98.7: Talk
Friday, March 13, 2026, 11:15–11:30, TRE/MATH
Interfacial charge dynamics in hybrid plasmonic-excitonic nanostructures — •Tommaso Pincelli1, Alessandro De Vita1, Gian Marco Pierantozzi2, Manuel Izquierdo3, Pavel Trofimov4, Trideep Kadwe4, Hélène Seiler4, Niclas S. Müller4, Caterina Cocchi5, Laurenz Rettig6, Martin Wolf6, Ralph Ernstorfer1, and Giancarlo Panaccione2 — 1Technische Univ. Berlin — 2IOM - CNR — 3EuXFEL — 4Freie Univ. Berlin — 5Fredrich Schiller Univ. Jena — 6Fritz Haber Inst. - MPG
Hybrid interfaces that merge plasmonic surfaces with 2D semiconductors are pivotal in energy materials research, allowing to tailor local fields and functionalize charge-transfer excitations. In this work, we exfoliate few-layer WSe2 on a plasmonic lattice of nanostructured Au in UHV. Angle-resolved reflectivity reveals a rich photonic band structure matching finite-element calculations. Using time and angle resolved photoemission spectroscopy (trARPES), we observe an ultrafast quench of excitonic signatures and hints of rapid interfacial charge transfer. Angle-integrated trPES at higher photon energies allows access to the buried interface by tracking shallow core levels. Notably, the plasmonic lattice induces a pronounced slowing of Au 4f peak shifting dynamics compared with unpatterned Au, suggesting a bottleneck in the interfacial charge transfer. These results highlight the potential of hybrid interfaces as flexible platforms for engineering optoelectronic responses at ultrafast timescales. We acknowledge the Energy Materials community proposal collaboration, the teams of SXP@EuXFEL and HEXTOF@FLASH.
Keywords: Photoemission spectroscopy; Ultrafast charge dynamics; transition metal dichalcogenide (TMDC); Plasmonic lattice; Exciton dynamics