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Brede, Jens; Merino-Díez, Nestor; Berdonces-Layunta, Alejandro; Sanz, Sofía; Domínguez-Celorrio, Amelia; Lobo-Checa, Jorge; Vilas-Varela, Manuel; Peña, Diego; Frederiksen, Thomas; Pascual, José I; de Oteyza, Dimas G; Serrate, David
Nature communications, 10/2023, Letnik: 14, Številka: 1Journal Article
Abstract Low dimensional carbon-based materials can show intrinsic magnetism associated to p-electrons in open-shell π -conjugated systems. Chemical design provides atomically precise control of the π -electron cloud, which makes them promising for nanoscale magnetic devices. However, direct verification of their spatially resolved spin-moment remains elusive. Here, we report the spin-polarization of chiral graphene nanoribbons (one-dimensional strips of graphene with alternating zig-zag and arm-chair boundaries), obtained by means of spin-polarized scanning tunnelling microscopy. We extract the energy-dependent spin-moment distribution of spatially extended edge states with π -orbital character, thus beyond localized magnetic moments at radical or defective carbon sites. Guided by mean-field Hubbard calculations, we demonstrate that electron correlations are responsible for the spin-splitting of the electronic structure. Our versatile platform utilizes a ferromagnetic substrate that stabilizes the organic magnetic moments against thermal and quantum fluctuations, while being fully compatible with on-surface synthesis of the rapidly growing class of nanographenes.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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