Journal
ACS NANO
Volume 14, Issue 4, Pages 4499-4508Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b10191
Keywords
graphene nanoribbons; topology; magnetism; edge states; on-surface synthesis; scanning tunneling microscopy; density functional theory
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Funding
- European Union (ERC) [635919]
- European Union (FET Open projects) [863098]
- Spanish MINECO [FIS2017-83780-P, MAT2016-78293-C6]
- University of the Basque Country [IT1246-19]
- European Research Council (ERC) [635919] Funding Source: European Research Council (ERC)
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We extensively characterize the electronic structure of ultranarrow graphene nanoribbons (GNRs) with armchair edges and zigzag termini that have five carbon atoms across their width (5-AGNRs), as synthesized on Au(111). Scanning tunneling spectroscopy measurements on the ribbons, recorded on both the metallic substrate and a decoupling NaCl layer, show well-defined dispersive bands and in-gap states. In combination with theoretical calculations, we show how these in-gap states are topological in nature and localized at the zigzag termini of the nanoribbons. In addition to rationalizing the driving force behind the topological class selection of S-AGNRs, we also uncover the length-dependent behavior of these end states which transition from singly occupied spin-split states to a closed-shell form as the ribbons become shorter. Finally, we demonstrate the magnetic character of the end states via transport experiments in a model two-terminal device structure in which the ribbons are suspended between the scanning probe and the substrate that both act as leads.
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