161978 20251017144603.0 doi 10.1038/s41467-025-60767-5 sideral 144618 ART-2025-144618 eng Domínguez-Celorrio, Amelia (orcid)0000-0001-8253-8741 Systematic modulation of charge and spin in graphene nanoribbons on MgO 2025 Access copy available to the general public Unrestricted In order to take full advantage of graphene nanostructures in quantum technologies, their charge and spin state must be precisely controlled. Graphene quantum dots require external gating potentials to tune their ground state. Here, we show systematic manipulation of the electron occupation in graphene nanoribbons lying on MgO layers grown on Ag(001). Owing to the efficient electronic decoupling character of MgO, and the electropositive nature of the substrate, the ribbons host an integer number of electrons that depend on their length and shape. This results in the alternation between a non-magnetic closed-shell state and an open-shell paramagnetic system for even and odd electron occupations respectively. For the odd case, we find a narrow Coulomb correlation gap, which is the smoking gun of its spin-½ state. Comparisons of scanning tunnelling microscopy data with mean-field Hubbard simulations confirm the discretization of the ribbons’ electronic states and charge excess of up to 19 electrons per ribbon. info:eu-repo/grantAgreement/ES/DGA/E13-23R info:eu-repo/grantAgreement/EUR/ERDF/EFA194-16TNSI info:eu-repo/grantAgreement/ES/MCIU/PID2019-107338RB-C64 info:eu-repo/grantAgreement/ES/MICINN AEI/PID2022-138750NB-C21 info:eu-repo/grantAgreement/ES/MICIU/CEX2023-001286-S info:eu-repo/semantics/openAccess by https://creativecommons.org/licenses/by/4.0/deed.es info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Edens, Leonard Sanz, Sofía Vilas-Varela, Manuel Martinez-Castro, Jose Peña, Diego Langlais, Véronique Frederiksen, Thomas Pascual, José I. Serrate, David (orcid)0000-0002-3260-9641 16 (2025), 5632 [8 pp.] Nature communications 2041-1723 2440356 http://zaguan.unizar.es/record/161978/files/texto_completo.pdf Versión publicada 2714563 http://zaguan.unizar.es/record/161978/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:161978 articulos driver 2025-10-17-14:14:37 ARTICLE