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We analyse the electrical response of narrow graphene nanogaps in search fortransport signatures stemming from spin-polarized edge states. We find that theelectrical transport across graphene nanogaps having perfectly defined zigzagedges does not carry any spin-related signature. We also analyse the magneticand electrical properties of nanogaps whose electrodes have wedges thatpossibly occur in the currently fabricated nanogaps. These wedges can host spinpolarized wedge low-energy states due to the bipartite nature of the graphenelattice. We find that these spin-polarized low-energy modes give rise tolow-voltage signatures in the differential conductance and to distinctivefeatures in the stability diagrams. These are caused by fully spin-polarizedcurrents.

Spin signatures in the electrical response of graphene nanogaps