Journal Article

FZJ-2026-00438

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Systematic modulation of charge and spin ingraphene nanoribbons on MgO

Domínguez-Celorrio, A. (First author) ; Edens, L. ; Sanz, S. ; Vilas-Varela, M. ; Martinez-Castro, J.FZJ* ; Peña, D. ; Langlais, V. ; Frederiksen, T. ; Pascual, J. I. ; Serrate, D. (Corresponding author)Extern*

2025
Springer Nature [London]

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Please use a persistent id in citations: doi:10.1038/s41467-025-60767-5  doi:10.34734/FZJ-2026-00438

Abstract: 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.

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Contributing Institute(s):

1. Quantum Nanoscience (PGI-3)

Research Program(s):

1. 5213 - Quantum Nanoscience (POF4-521) (POF4-521)

Appears in the scientific report 2025

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