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Detecting the spin-polarization of edge states in graphene nanoribbons

Author

Listed:
  • Jens Brede

    (Donostia International Physics Center
    CSIC-UPV/EHU)

  • Nestor Merino-Díez

    (Donostia International Physics Center
    CSIC-UPV/EHU)

  • Alejandro Berdonces-Layunta

    (Donostia International Physics Center
    CSIC-UPV/EHU)

  • Sofía Sanz

    (Donostia International Physics Center)

  • Amelia Domínguez-Celorrio

    (CSIC-Universidad de Zaragoza)

  • Jorge Lobo-Checa

    (CSIC-Universidad de Zaragoza
    Universidad de Zaragoza
    Universidad de Zaragoza)

  • Manuel Vilas-Varela

    (Universidade de Santiago de Compostela)

  • Diego Peña

    (Universidade de Santiago de Compostela)

  • Thomas Frederiksen

    (Donostia International Physics Center
    Ikerbasque, Basque Foundation for Science)

  • José I. Pascual

    (Ikerbasque, Basque Foundation for Science
    CIC nanoGUNE BRTA)

  • Dimas G. Oteyza

    (Donostia International Physics Center
    CSIC-UPV/EHU
    CSIC-UNIOVI-PA)

  • David Serrate

    (CSIC-Universidad de Zaragoza
    Universidad de Zaragoza
    Universidad de Zaragoza)

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.

Suggested Citation

  • Jens Brede & Nestor Merino-Díez & Alejandro Berdonces-Layunta & Sofía Sanz & Amelia Domínguez-Celorrio & Jorge Lobo-Checa & Manuel Vilas-Varela & Diego Peña & Thomas Frederiksen & José I. Pascual & Di, 2023. "Detecting the spin-polarization of edge states in graphene nanoribbons," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-42436-7
    DOI: 10.1038/s41467-023-42436-7
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    References listed on IDEAS

    as
    1. Jingcheng Li & Sofia Sanz & Nestor Merino-Díez & Manuel Vilas-Varela & Aran Garcia-Lekue & Martina Corso & Dimas G. de Oteyza & Thomas Frederiksen & Diego Peña & Jose Ignacio Pascual, 2021. "Topological phase transition in chiral graphene nanoribbons: from edge bands to end states," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    2. Jingcheng Li & Sofia Sanz & Martina Corso & Deung Jang Choi & Diego Peña & Thomas Frederiksen & Jose Ignacio Pascual, 2019. "Single spin localization and manipulation in graphene open-shell nanostructures," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
    3. Michael Slota & Ashok Keerthi & William K. Myers & Evgeny Tretyakov & Martin Baumgarten & Arzhang Ardavan & Hatef Sadeghi & Colin J. Lambert & Akimitsu Narita & Klaus Müllen & Lapo Bogani, 2018. "Publisher Correction: Magnetic edge states and coherent manipulation of graphene nanoribbons," Nature, Nature, vol. 561(7723), pages 31-31, September.
    4. Raymond E. Blackwell & Fangzhou Zhao & Erin Brooks & Junmian Zhu & Ilya Piskun & Shenkai Wang & Aidan Delgado & Yea-Lee Lee & Steven G. Louie & Felix R. Fischer, 2021. "Spin splitting of dopant edge state in magnetic zigzag graphene nanoribbons," Nature, Nature, vol. 600(7890), pages 647-652, December.
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