%0 Electronic Article
%A Martinez-Castro, Jose
%A Bolat, Rustem
%A Fan, Qitang
%A Werner, Simon
%A Arefi, Hadi
%A Esat, Taner
%A Sundermeyer, Jörg
%A Wagner, Christian
%A Gottfried, J. Michael
%A Temirov, Ruslan
%A Ternes, Markus
%A Tautz, F. Stefan
%T Disentangling the Complex Electronic Structure of an Adsorbed Nanographene: Cycloarene C108
%I arXiv
%M FZJ-2025-02318
%D 2021
%X 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 without introducing spurious artifacts. 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.
%K Mesoscale and Nanoscale Physics (cond-mat.mes-hall) (Other)
%K FOS: Physical sciences (Other)
%F PUB:(DE-HGF)25
%9 Preprint
%R 10.48550/ARXIV.2110.11449
%U https://juser.fz-juelich.de/record/1041579