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We present a microscopic theory for interacting graphene armchair nanoribbonquantum dots. Long range interaction processes are responsible for Coulombblockade and spin-charge separation. Short range ones, arising from theunderlying honeycomb lattice of graphene, smear the spin-charge separation andinduce exchange correlations between bulk electrons - delocalized on the ribbon- and single electrons localized at the two ends. As a consequence, entangledend-bulk states where the bulk spin is no longer a conserved quantity occur.Entanglement's signature is the occurrence of negative differential conductanceeffects in a fully symmetric set-up due to symmetry-forbidden transitions.

Graphene armchair nanoribbon single-electron transistors: The peculiar influence of end states