Dresden 2020 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 49: Poster Session - Organic Molecules on Inorganic Substrates: Electronic, Optical and Other
O 49.2: Poster
Dienstag, 17. März 2020, 18:15–20:00, P2/EG
Single-molecule vibrational progression on two-dimensional materials — •Alexander Mehler1, Nicolas Néel1, Johannes Halle1, Marie-Laure Bocquet2, and Jörg Kröger1 — 1Institut für Physik, Technische Universität Ilmenau, Ilmenau, Germany — 2École normale supérieure, PSL University, Sorbonne Université, CNRS, France
Probing genuine molecular properties even after adsorption on a surface requires the efficient reduction of the molecule-surface hybridization. Two-dimensional materials, such as graphene, hexagonal Boron Nitride (hBN) and stackings thereof, are promising buffer layers to this end. Scanning tunneling microscopy and spectroscopy at low temperature is used to explore molecular orbitals and vibrational quanta of the hydrocarbon molecule DBP (Dibenzotetraphenylperiflanthen) on graphene and hBN with submolecular resolution. Independent of the metal substrate, Ir(111), Pt(111) and Ru(0001), vibrational progression in both DBP frontier orbitals is observed for graphene and hBN, albeit with different numbers of vibrational quanta involved. Density functional calculations unveil that symmetry matching of electronic and vibrational excitations supports the observation of vibrational progression. The lifetime of the vibronic levels can be tuned by the molecular environment of a single DBP as well as by using different kinds and numbers of buffer layers.