Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 74: Organic Molecules at Surfaces 5: Molecular Switches
O 74.10: Vortrag
Donnerstag, 8. September 2022, 17:15–17:30, S054
Evidence of trion-libron coupling in chirally adsorbed single molecules — •Jiří Doležal1,2, Sofia Canola1, Prokop Hapala1, Rodrigo Ferreira1, Pablo Merino3, and Martin Švec1 — 1Institute of Physics, Czech Academy of Sciences; Cukrovarnická 10/112, CZ16200 Praha 6, Czech Republic — 2Faculty of Mathematics and Physics, Charles University; Ke Karlovu 3, CZ12116 Praha 2, Czech Republic — 3Instituto de Ciencia de Materiales de Madrid; CSIC, Sor Juana Inés de la Cruz 3, E28049 Madrid, Spain
Interplay between the motion of nuclei and excited electrons in molecules plays a key role both in biological and artificial nanomachines. Here we provide a detailed analysis of coupling between quantized librational modes (librons) and charged excited states (trions) on single phthalocyanine dyes adsorbed on a surface. By means of tunnelling electron-induced electroluminescence, we identify libronic progressions on a µeV energy range in spectra of chirally adsorbed phthalocyanines, which are otherwise absent from spectra of symmetrically adsorbed species. Experimentally measured libronic spectra match very well the theoretically calculated libron eigenenergies and peak intensities (Franck-Condon factors) and reveal an unexpected depopulation channel for the zero libron of the excited state that can be effectively controlled by tuning the size of the nanocavity. Our results showcase the possibility of characterizing the dynamics of molecules by their low-energy molecular modes using µeV-resolved tip-enhanced spectroscopy.