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O: Fachverband Oberflächenphysik
O 24: Poster Session II: Plasmonics and nanooptics II
O 24.4: Poster
Montag, 1. März 2021, 13:30–15:30, P
Mechano-optical switching of a single molecule with doublet emission — Jiří Doležal1, Pingo Mutombo1, Dana Nachtigallová2, Pavel Jelínek1, •Pablo Merino3, and Martin Švec1 — 1Institute of Physics, Czech Academy of Sciences, Praha, Czech Republic — 2Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Praha, Czech Republic — 3Instituto de Ciencia de Materiales de Madrid, CSIC, Sor Juana Inés de la Cruz 3, E28049, Madrid, Spain
Phthalocyanine and derived metal complexes on thin insulating layers studied by scanning tunneling microscope-induced luminescence (STML) offers an excellent playground for tuning their excitonic and electronic states by Coulomb interaction and to showcase their high environmental sensitivity.[1] Copper phthalocyanine (CuPc) has an open-shell electronic structure and its lowest-energy exciton is a doublet which brings interesting prospects in its application for optospintronic devices. Here, we demonstrate that the excitonic state of a single CuPc molecule can be reproducibly switched by atomic scale manipulations permitting precise positioning of the molecule on the NaCl ionic crystal lattice.[2] Using a combination of STML, AFM and ab-initio calculations, we show the modulation of electronic and optical bandgaps, and the exciton binding energy in CuPc by tens of meV. We explain this effect by spatially-dependent Coulomb interaction occurring at the molecule-insulator interface, which tunes the local dielectric environment of the emitter.References:[1] J. Doležal et al., Nano Letters, 19 8606 (2019).[2] J. Doležal et al., ACS Nano, 14, 8931 (2020).