Regensburg 2025 – scientific programme

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O: Fachverband Oberflächenphysik

O 20: Poster Scanning Probe Microscopy: Light-Matter Interactions at the Atomic Scale

O 20.8: Poster

Monday, March 17, 2025, 18:00–20:00, P2

Neutral Exciton-Libron Coupling via Resonant Energy Transfer in Single Molecules — •Thiago G. L. Brito¹, Klaus Kuhnke¹, Klaus Kern^1,2, and Anna Rosławska¹ — ¹Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany — ²École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland

The optical properties of single molecules can vary depending on their environment. In some surroundings, vibrations due to frustrated rotations (librations) may occur if the molecules feature some rotational freedom. In this study, we provide evidence of coupling between neutral excitons and libration modes (librons). We observed this coupling through light emission resulting from resonant energy transfer (RET). We measured neutral and charged exciton emissions in isolated zinc phthalocyanine (ZnPc) and ZnPc-platinum phthalocyanine (PtPc) assemblies deposited on NaCl/Ag(111) using scanning tunneling microscopy induced luminescence (STML). For isolated ZnPc, we observed a broad peak from the neutral exciton and exciton-libron coupling for the charged exciton. In contrast, in ZnPc-PtPc structures, we found libronic signatures in the neutral emission of ZnPc when excited via RET from PtPc. This study is providing deeper insights into exciton-libron dynamics in single molecules.

Keywords: Libron; Resonant Energy Transfer; Zinc Phthalocyanine; STML