Delocalized spin states at zigzag termini of armchair graphene nanoribbon

Abstract Using scanning tunneling microscopy and spectroscopy we demonstrate a revival of magnetism in 7-armchair nanoribbon by unpassivated atoms at the termini. Namely, a pair of intense Kondo resonances emerges at the peripheries of zigzag terminus revealing the many-body screening effects of loc...

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Bibliographic Details
Published in:Scientific Reports
Main Authors: Stefan Šćepanović, Amina Kimouche, Jovan Mirković, Gehad Sadiek, Tillmann Klamroth, Abdou Hassanien
Format: Article
Language:English
Published: Nature Portfolio 2024-05-01
Subjects:
Graphene nanoribbon
Spin states
Kondo effect
Spin–spin correlations
Online Access:https://doi.org/10.1038/s41598-024-62624-9
Description
Summary:Abstract Using scanning tunneling microscopy and spectroscopy we demonstrate a revival of magnetism in 7-armchair nanoribbon by unpassivated atoms at the termini. Namely, a pair of intense Kondo resonances emerges at the peripheries of zigzag terminus revealing the many-body screening effects of local magnetic moments. Although Kondo resonance originates from a missing local orbital, it extends to a distance of 2.5 nm along the edge of the ribbon. The results are complemented by density functional theory calculations which suggest a possible coupling between Kondo states despite screening effects of substrate electrons. These findings indicate a possibility to restore intrinsic magnetic ordering in graphene nanoribbon without major structural modifications.
ISSN:2045-2322

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