Mapping the Slow Stabilization of End States with Length along a Laterally Extended Graphene Nanoribbon
With a lateral bisnaphtho-extended chemical structure, finite 7-13 carbon atom wide armchair graphene nanoribbons (7-13-aGNRs) were on-surface synthesized. For all lengths up to <i>N</i> = 7 monomer units, low-temperature ultrahigh vacuum scanning tunneling spectroscopy and spatial d<i>I</i>/d<i>V</i> maps were recorded at each captured tunneling resonance. The degeneracy of the two central electronic end states (ESs) occurs in a slowly decaying regime with <i>N</i> converging toward zero for <i>N</i> = 6 long 7-13-aGNR (12 bonded anthracenes), while it is <i>N</i> = 2 (4 bonded anthracenes) for seven carbon atoms wide armchair GNRs (7-aGNRs). The two end d<i>I</i>/d<i>V</i> conductance maxima of ESs are also shifted away from strictly two ends of the 7-13-aGNR compared to the 7-aGNR. Using the quantum topology graph filiation between finite length polyacetylene and 7-13-aGNRs wires, we show that this slow decay of 7-13-aGNR ESs is coming from the property of the topological Hückel band matrix that expels the ESs into its eigenvalue spectrum gaps to keep harmony in the core spectrum.
Authors
- Diego Peña (ORCID: https://orcid.org/0000-0003-3814-589X)
- Umamahesh Thupakula (ORCID: https://orcid.org/0000-0003-0508-6029)
- Georges Trinquier (ORCID: https://orcid.org/0000-0001-7216-8900)
- We-Hyo Soe (ORCID: https://orcid.org/0000-0003-2081-4039)
- Xavier Bouju (ORCID: https://orcid.org/0000-0001-7827-3496)
- Jesús Castro‐Esteban (ORCID: https://orcid.org/0000-0003-0100-943X)
- Afnan Al Saati
- Christian Joachim
Institutions
- Centre National de la Recherche Scientifique (FR)
- Université Toulouse III - Paul Sabatier (FR)
- Université Fédérale de Toulouse Midi-Pyrénées (FR)
- Universidade de Santiago de Compostela (ES)
- National Institute for Materials Science (JP)
- Center for Research in Molecular Medicine and Chronic Diseases (ES)
- Centre d’Élaboration de Matériaux et d’Études Structurales (FR)
- Laboratoire de Chimie et Physique Quantiques (FR)
Publication Details
- Journal
- The Journal of Physical Chemistry Letters
- Published
- 2024-08-22
- DOI
- https://doi.org/10.1021/acs.jpclett.4c02256
- Citations
- 1
- Primary Topic
- Quantum and electron transport phenomena
- Type
- article
- Field-Weighted Citation Impact
- 0.34
Funders
- Ministry of Education, Culture, Sports, Science and Technology
- Xunta de Galicia
- Horizon 2020 Framework Programme
- National Institute for Materials Science
- European Regional Development Fund
- Agencia Estatal de Investigación
- H2020 Marie Skłodowska-Curie Actions