Enhancement of Graphene Phonon Excitation by a Chemically Engineered Molecular Resonance

Xiaocui Wu, Nicolas Néel, Mads Brandbyge, Jörg Kröger*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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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.

Original languageEnglish
Article number116201
JournalPhysical Review Letters
Issue number11
Number of pages6
Publication statusPublished - 2023


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