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Título: | Probing the magnetism of topological end states in 5-armchair graphene nanoribbons |
Autor: | Lawrence, James CSIC ORCID; Brandimarte, Pedro CSIC ORCID CVN; Berdonces-Layunta, Alejandro CSIC; Mohammed, Mohammed S. G.; Grewal, Abhishek; Leon, Christopher C.; Sánchez-Portal, Daniel CSIC ORCID ; Oteyza, Dimas G. de CSIC ORCID | Fecha de publicación: | 2020 | Editor: | American Chemical Society | Citación: | ACS Nano 14(4): 4499–4508 (2020) | Resumen: | 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 5-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. | Versión del editor: | https://doi.org/10.1021/acsnano.9b10191 | URI: | http://hdl.handle.net/10261/218530 | DOI: | 10.1021/acsnano.9b10191 | ISSN: | 1936-0851 | E-ISSN: | 1936-086X |
Aparece en las colecciones: | (CFM) Artículos |
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probibbons.pdf | 3,3 MB | Adobe PDF | Visualizar/Abrir |
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