Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 57: Ultrafast Electron and Spin Dynamics

O 57.7: Poster

Dienstag, 21. März 2017, 18:30–20:30, P2-EG

Mahan cone formation and time-resolved two-photon photoemission of the adsorbate system Tin-Phthalocyanine on Ag(111) — •Stephan Jauernik, Petra Hein, Max Gurgel, Julian Falke, and Michael Bauer — Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Germany

Recently, the adsorption of tin-phthalocyanine (SnPc) on Ag(111) has attracted considerable interest due to peculiarities in the adsorbate-substrate interaction and switching capabilities reported for the adsorbed SnPc [1]. Using Low Energy Electron Diffraction (LEED) and Photoemission/Two-Photon Photoemission (PES/2PPE) we address in this work the correlation of structural and electronic properties of this model-type system in the incommensurate adsorption phase which forms in the coverage regime between 0.90 ML and 1.0 ML. 1PPE data of 1ML SnPc on Ag(111) reveal the formation of Mahan cones [2,3] which we associate with a direct optical transition within the Ag sp-band modified by diffraction in the presence of the 2D adsorbate superstructure. Using time-resolved bichromatic 2PPE we focus on the electronic structure of the adsorbate layer and the characteristic relaxation dynamics of molecular resonances.

[1] C. Stadler et al., Nature Physics 5, 153 (2009)

[2] G. D. Mahan, Phys. Rev. B 2, 4334 (1970)

[3] Winkelmann et al., New Journal of Physics, Volume 14 (2012)