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Detecting the spin-polarization of edge states in graphene nanoribbons
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Detecting the spin-polarization of edge states in graphene nanoribbons
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Journal Article
Detecting the spin-polarization of edge states in graphene nanoribbons
2023
Overview
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.
Zig-Zag graphene nanoribbons have edge states that are predicted to be spin-polarized, however, measurement of these spin-polarized states has proved elusive. Here, Brede et al overcome this challenge by growing graphene nanoribbons on ferromagnetic GdAu2, allowing for the direct observation of the spin-polarized edge states.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
