Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 98: Ultrafast electron dynamics at surface and interfaces IV

O 98.7: Vortrag

Freitag, 13. März 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