DPG Phi
Verhandlungen
Verhandlungen
DPG

Berlin 2024 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

O: Fachverband Oberflächenphysik

O 53: 2D Materials IV: Graphene (joint session O/TT)

O 53.9: Talk

Wednesday, March 20, 2024, 17:15–17:30, MA 005

Enhancement of graphene phonon excitation by a chemically engineered molecular resonanceXiaocui Wu1, •Nicolas Néel1, Mads Brandbyge2, and Jörg Kröger11Institut für Physik, Technische Universität Ilmenau, D-98693 Ilmenau, Germany — 2Center of Nanostructured Graphene, Department of Physics, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark

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. Funding by the Deutsche Forschungsgemeinschaft through Grant No. KR 2912/17-1 is acknowledged.

Keywords: Scanning tunneling microscope; Inelastic electron tunneling; Phonons; Single molecule chemistry

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2024 > Berlin