000161978 001__ 161978
000161978 005__ 20251017144603.0
000161978 0247_ $$2doi$$a10.1038/s41467-025-60767-5
000161978 0248_ $$2sideral$$a144618
000161978 037__ $$aART-2025-144618
000161978 041__ $$aeng
000161978 100__ $$0(orcid)0000-0001-8253-8741$$aDomínguez-Celorrio, Amelia
000161978 245__ $$aSystematic modulation of charge and spin in graphene nanoribbons on MgO
000161978 260__ $$c2025
000161978 5060_ $$aAccess copy available to the general public$$fUnrestricted
000161978 5203_ $$aIn order to take full advantage of graphene nanostructures in quantum technologies, their charge and spin state must be precisely controlled. Graphene quantum dots require external gating potentials to tune their ground state. Here, we show systematic manipulation of the electron occupation in graphene nanoribbons lying on MgO layers grown on Ag(001). Owing to the efficient electronic decoupling character of MgO, and the electropositive nature of the substrate, the ribbons host an integer number of electrons that depend on their length and shape. This results in the alternation between a non-magnetic closed-shell state and an open-shell paramagnetic system for even and odd electron occupations respectively. For the odd case, we find a narrow Coulomb correlation gap, which is the smoking gun of its spin-½ state. Comparisons of scanning tunnelling microscopy data with mean-field Hubbard simulations confirm the discretization of the ribbons’ electronic states and charge excess of up to 19 electrons per ribbon.
000161978 536__ $$9info:eu-repo/grantAgreement/ES/DGA/E13-23R$$9info:eu-repo/grantAgreement/EUR/ERDF/EFA194-16TNSI$$9info:eu-repo/grantAgreement/ES/MCIU/PID2019-107338RB-C64$$9info:eu-repo/grantAgreement/ES/MICINN AEI/PID2022-138750NB-C21$$9info:eu-repo/grantAgreement/ES/MICIU/CEX2023-001286-S
000161978 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttps://creativecommons.org/licenses/by/4.0/deed.es
000161978 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000161978 700__ $$aEdens, Leonard
000161978 700__ $$aSanz, Sofía
000161978 700__ $$aVilas-Varela, Manuel
000161978 700__ $$aMartinez-Castro, Jose
000161978 700__ $$aPeña, Diego
000161978 700__ $$aLanglais, Véronique
000161978 700__ $$aFrederiksen, Thomas
000161978 700__ $$aPascual, José I.
000161978 700__ $$0(orcid)0000-0002-3260-9641$$aSerrate, David
000161978 773__ $$g16 (2025), 5632 [8 pp.]$$tNature communications$$x2041-1723
000161978 8564_ $$s2440356$$uhttps://zaguan.unizar.es/record/161978/files/texto_completo.pdf$$yVersión publicada
000161978 8564_ $$s2714563$$uhttps://zaguan.unizar.es/record/161978/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000161978 909CO $$ooai:zaguan.unizar.es:161978$$particulos$$pdriver
000161978 951__ $$a2025-10-17-14:14:37
000161978 980__ $$aARTICLE