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Conversion of electric current into heat involves microscopic processes thatoperate on nanometer length-scales and release minute amounts of power. Whilecentral to our understanding of the electrical properties of materials,individual mediators of energy dissipation have so far eluded directobservation. Using scanning nano-thermometry with sub-micro K sensitivity wevisualize and control phonon emission from individual atomic defects ingraphene. The inferred electron-phonon 'cooling power spectrum' exhibits sharppeaks when the Fermi level comes into resonance with electronic quasi-boundstates at such defects, a hitherto uncharted process. Rare in the bulk butabundant at graphene's edges, switchable atomic-scale phonon emitters definethe dominant dissipation mechanism. Our work offers new insights for addressingkey materials challenges in modern electronics and engineering dissipation atthe nanoscale.

Imaging resonant dissipation from individual atomic defects in graphene