Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 5: Organic Molecules at Surfaces 1: Substrate Effects

O 5.5: Vortrag

Montag, 5. September 2022, 11:45–12:00, S051

Disentangling the Complex Electronic Structure of an Adsorbed Nanographene: Cycloarene C108 — •Jose Martinez-Castro¹, Rustem Bolat¹, Qitang Fan², Simon Werner², Hadi Arefi¹, Taner Esat¹, Jörg Sundermeyer², Christian Wagner¹, J. Michael Gottfried², Ruslan Temirov^1,3, Markus Ternes^1,4, and F. Stefan Tautz¹ — ¹Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany — ²Department of Chemistry, Philipps-Universität Marburg, 35032 Marburg, Germany — ³II. Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany — ⁴II. Institute of Physics, RWTH Aachen University, D-52074 Aachen, Germany.

We combine low-temperature scanning tunneling spectroscopy, CO functionalized tips and algorithmic data analysis to investigate the electronic structure of the molecular cycloarene C108 (graphene nanoring) adsorbed on a Au(111) surface. We demonstrate that CO functionalized tips enhance the visibility of molecular resonances, both in differential conductance spectra and in real-space topographic images. Comparing our experimental data with ab-initio density functional theory reveals a remarkably precise agreement of the molecular orbitals and enables us to disentangle close-lying molecular states only separated by 50 meV at an energy of 2 eV below the Fermi level. We propose this combination of techniques as a promising new route for a precise characterization of complex molecules and other physical entities which have electronic resonances in the tip-sample junction.