Evidence of exciton-libron coupling in chirally adsorbed single molecules

0563253 - FZÚ 2023 RIV GB eng J - Journal Article
Doležal, Jiří - Canola, Sofia - Hapala, Prokop - de Campos Ferreira, Rodrigo Cezar - Merino, P. - Švec, Martin
Evidence of exciton-libron coupling in chirally adsorbed single molecules.
Nature Communications. Roč. 13, č. 1 (2022), č. článku 6008. E-ISSN 2041-1723
R&D Projects: GA ČR(CZ) GA20-18741S
Institutional support: RVO:68378271
Keywords : STM-EL * trion * libron * phthalocyanine * chiral * Franck-Condon
OECD category: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
Impact factor: 16.6, year: 2022
Method of publishing: Open access

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 tip-induced electroluminescence performed with a scanning probe microscope, we identify libronic signatures in spectra of chirally adsorbed phthalocyanines and find that these signatures are absent from spectra of symmetrically adsorbed species. We create a model of the libronic coupling based on the Franck-Condon principle to simulate the spectral features. Experimentally measured librational spectra match very well the theoretically calculated librational eigenenergies and peak intensities (Franck-Condon factors). Our results showcase the possibility of characterizing the dynamics of molecules by their low-energy molecular modes using µeV-resolved tip-enhanced spectroscopy.
Permanent Link: https://hdl.handle.net/11104/0338043