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O: Fachverband Oberflächenphysik
O 16: Ultrafast Electron Dynamics at Surface and Interfaces II
O 16.7: Vortrag
Montag, 27. März 2023, 16:45–17:00, TRE Phy
Multi-directional energy transfer across hybrid plasmonic-excitonic interface — •Tommaso Pincelli1, Thomas Vasileiadis1, Shuo Dong1, Samuel Beaulieu1, Maciej Dendzik1, Daniela Zahn1, Sang-Eun Lee1, Hélène Seiler1, Yinpeng Qi1, Rui Patrick Xian1, Julian Maklar1, Emerson Coy2, Niclas S. Mueller3, Yu Okamura3, Stephanie Reich3, Martin Wolf1, Laurenz Rettig1, and Ralph Ernstorfer1 — 1Fritz-Haber-Institut der MPG, Berlin, Germany — 2NanoBioMedical Centre, Adam Mickiewicz University, Poznan, Poland — 3Freie Universität Berlin, Berlin, Germany
Hybrid plasmonic devices involve a nanostructured metal supporting localized surface plasmons to amplify light-matter interaction, and a non-plasmonic material to functionalize charge excitations. We combine the use of time and angle-resolved photoemission spectroscopy and femtosecond electron diffraction to investigate charge carrier and phonon dynamics in such a system: epitaxial Au nanoislands on bulk WSe2. The Au nanostructures show delayed electronic temperature increase and cause a shortening of the Σ-exciton lifetime. Lattice heating is accelerated in WSe2 and delayed in Au. Our results resolve a multi-directional energy exchange on timescales shorter than the electronic thermalization of the nanometal, driven by a non-linear plasmon-exciton interaction. Non-radiative exciton recombination, electron-phonon coupling, and diffusive charge-transfer determine the subsequent energy backflow.