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We unveil the nature of the structural disorder in bottom-up zigzag graphenenanoribbons along with its effect on the magnetism and electronic transport onthe basis of scanning probe microscopies and first-principles calculations. Wefind that edge-missing m-xylene units emerging during the cyclodehydrogenationstep of the on-surface synthesis are the most common point defects. These"bite'' defects act as spin-1 paramagnetic centers, severely disrupt theconductance spectrum around the band extrema, and give rise to spin-polarizedcharge transport. We further show that the electronic conductance acrossgraphene nanoribbons is more sensitive to "bite" defects forming at the zigzagedges than at the armchair ones. Our work establishes a comprehensiveunderstanding of the low-energy electronic properties of disordered bottom-upgraphene nanoribbons.

Edge Disorder in Bottom-Up Zigzag Graphene Nanoribbons: Implications for Magnetism and Quantum Electronic Transport