Universität zu Köln

Martinez-Castro, Jose, Bolat, Rustem, Fan, Qitang, Werner, Simon, Arefi, Hadi H., Esat, Taner, Sundermeyer, Jorg, Wagner, Christian, Gottfried, J. Michael, Temirov, Ruslan ORCID: 0000-0001-8290-6831, Ternes, Markus ORCID: 0000-0001-6800-4129 and Tautz, F. Stefan (2022). Disentangling the electronic structure of an adsorbed graphene nanoring by scanning tunneling microscopy. Commun. Mater., 3 (1). LONDON: SPRINGERNATURE. ISSN 2662-4443

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Abstract

Scanning tunneling microscopy is a powerful tool for determining the electronic structure of surface adsorbates. Here, carbon monoxide functionalized tips enable more accurate probing of the molecular states of graphene nanorings adsorbed on a gold surface. Graphene nanorings are promising model structures to realize persistent ring currents and Aharonov-Bohm effect at the single molecular level. To investigate such intriguing effects, precise molecular characterization is crucial. Here, we combine low-temperature scanning tunneling imaging and spectroscopy with 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 electronic characterization of complex molecules and other physical properties which have electronic resonances in the tip-sample junction.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Martinez-Castro, Jose UNSPECIFIED UNSPECIFIED UNSPECIFIED Bolat, Rustem UNSPECIFIED UNSPECIFIED UNSPECIFIED Fan, Qitang UNSPECIFIED UNSPECIFIED UNSPECIFIED Werner, Simon UNSPECIFIED UNSPECIFIED UNSPECIFIED Arefi, Hadi H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Esat, Taner UNSPECIFIED UNSPECIFIED UNSPECIFIED Sundermeyer, Jorg UNSPECIFIED UNSPECIFIED UNSPECIFIED Wagner, Christian UNSPECIFIED UNSPECIFIED UNSPECIFIED Gottfried, J. Michael UNSPECIFIED UNSPECIFIED UNSPECIFIED Temirov, Ruslan UNSPECIFIED orcid.org/0000-0001-8290-6831 UNSPECIFIED Ternes, Markus UNSPECIFIED orcid.org/0000-0001-6800-4129 UNSPECIFIED Tautz, F. Stefan UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-682300
DOI:	10.1038/s43246-022-00275-x
Journal or Publication Title:	Commun. Mater.
Volume:	3
Number:	1
Date:	2022
Publisher:	SPRINGERNATURE
Place of Publication:	LONDON
ISSN:	2662-4443
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MOLECULE Multiple languages Materials Science, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68230