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Updated: Aug 4, 2025

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
Enhancement of Graphene Phonon Excitation by a Chemically Engineered Molecular Resonance
Xiaocui Wu1, Nicolas Néel1, Mads Brandbyge2
1Institut für Physik, Technische Universität Ilmenau, D-98693 Ilmenau, Germany.
Abstract:
The abstraction of pyrrolic hydrogen from a single phthalocyanine on graphene turns the molecule into a sensitive probe for graphene phonons. The inelastic electron transport measured with a scanning tunneling microscope across the molecular adsorbate and graphene becomes strongly enhanced for a graphene out-of-plane acoustic phonon mode. Supporting density functional and transport calculations elucidate the underlying physical mechanism. A molecular orbital resonance close to the Fermi energy controls the inelastic current while specific phonon modes of graphene are magnified due to their coupling to symmetry-equivalent vibrational quanta of the molecule.
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