Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 68: Graphene: Electronic structure, excitations, etc. – Poster (joint session O/TT)
TT 68.7: Poster
Mittwoch, 11. März 2026, 18:00–20:00, P2
Optimizing the excitation cross section for graphene phonons in inelastic electron tunnelling via intercalation. — Karl Rothe1, •Nicolas Néel1, Mads Brandbyge2, and Jörg Kröger1 — 1Institut 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
Platinum-intercalated graphene on a (111)-oriented iridium surface gives rise to a variety of rotational domains, which exhibit characteristic moiré patterns. Independent of the twist angle subtended by the graphene and substrate lattice, inelastic electron tunnelling spectroscopy reveals elevated graphene phonon excitation only on the intercalated phases. Combining spatially resolved spectroscopy of the electronic structure with non-equilibrium Green's function simulations highlights the relevance for effective phonon creation of the balance between elastic and inelastic electron transport. The intercalation-induced shift of electron density of states from the Brillouin zone centre to its boundary enhances the inelastic channel at the expense of the elastic channel and thereby increases the phonon excitation cross section. Financial support by the Deutsche Forschungsgemeinschaft through KR 2912/18-1 is acknowledged.
Keywords: scanning tunelling microscopy and spectroscopy; graphene; intercalation; moiré pattern; phonon