DataVXThe Journal of Physical Chemistry LettersPaper
journal article·2024-09-05Open access

Mapping the Slow Stabilization of End States with Length along a Laterally Extended Graphene Nanoribbon

Umamahesh Thupakula, We-Hyo Soe, Jesús Castro-Esteban, Afnan Al Saati, Georges Trinquier, Xavier Bouju, Diego Peña, Christian Joachim

The Journal of Physical Chemistry Letters· Volume 15· Issue 35
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Source abstract

Abstract

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 N = 7 monomer units, low-temperature ultrahigh vacuum scanning tunneling spectroscopy and spatial d I /d V 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 N converging toward zero for N = 6 long 7–13-aGNR (12 bonded anthracenes), while it is N = 2 (4 bonded anthracenes) for seven carbon atoms wide armchair GNRs (7-aGNRs). The two end d I /d V 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.
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Research context

Nanomaterials

OpenAlex topics: Quantum and electron transport phenomena · Molecular Junctions and Nanostructures · Quantum Information and Cryptography

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Affiliations

Centre d’Élaboration de Matériaux et d’Études Structurales (CEMES), Centre National de la Recherche Scientifique (CNRS-UPR 8011), FeRMI, Université de Toulouse III - Paul Sabatier, 29 Rue Jeanne Marvig, BP 94347, 31055 Toulouse Cedex, France

Centro Singular de Investigaciónen Química Biolóxica e Materiais Moleculares (CiQUS) and Departamento de Química Orgánica, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain

Laboratoire de Chimie et Physique Quantiques (CNRS-UMR 5626), FeRMI, Université de Toulouse III - Paul Sabatier, 31062 Toulouse Cedex, France

International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Material Sciences (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan

Funding

Ministry of Education, Culture, Sports, Science and Technology · Agencia Estatal de Investigaci?n · European Regional Development Fund · H2020 Marie Sklodowska-Curie Actions · Xunta de Galicia

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