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O: Fachverband Oberflächenphysik
O 83: Organic molecules on inorganic substrates: electronic, optical and other properties III
O 83.8: Vortrag
Donnerstag, 12. März 2026, 16:45–17:00, HSZ/0201
Spatial Mapping of Vibronic Excitations in a Single Organometallic Complex — Xiangzhi Meng1, Kai Uwe Clausen2, Marie-Laure Bocquet3, •Alexander Weismann1, Niklas Ide1, Felix Tuczek2, and Richard Berndt1 — 1Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany — 2Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany — 3Laboratoire de Physique de l'École normale supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université Paris Cité, 75005 Paris, France
Vibronic excitations in single molecules at nanoscale interfaces are central to molecular electronics and are usually modeled with a double-barrier tunneling junction that assumes a homogeneous electric field and ignores atomic details of the contacts. Using STM measurements of a nonplanar organometallic complex on Ag(111), we obtain spatially resolved vibronic maps that reveal shifts in excitation energies caused by reordering of occupied molecular orbitals under the rapidly decaying tip potential. These shifts vary strongly with tip position. Combined with modeling, our results show that tip-induced, atomically varying electric fields can actively control molecular orbitals and must be considered in studies of nonplanar molecules.
Keywords: Scanning Tunneling Spectroscopy; Molecules on Surfaces