Journal
SCIENCE
Volume 358, Issue 6368, Pages 1303-1306Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aan0877
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Funding
- Minerva Foundation
- German Federal Ministry of Education and Research
- NSF/DMR-BSF Binational Science Foundation (BSF) [2015653]
- NSF [1609519]
- Weizmann-UK Making Connections Programme
- Rosa and Emilio Segre Research Award
- Lloyd's Register Foundation
- European Research Council ARTIMATTER project (ERC-ADG)
- MISTI (MIT International Science and Technology Initiatives) MIT-Israel Seed Fund
- Directorate For Engineering [2015653] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1609519] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys [2015653] Funding Source: National Science Foundation
- EPSRC [EP/N010345/1, EP/K005014/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/N010345/1] Funding Source: researchfish
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Conversion of electric current into heat involves microscopic processes that operate on nanometer length scales and release minute amounts of power. Although central to our understanding of the electrical properties of materials, individual mediators of energy dissipation have so far eluded direct observation. Using scanning nanothermometry with submicrokelvin sensitivity, we visualized and controlled phonon emission from individual atomic-scale defects in graphene. The inferred electron-phonon cooling power spectrum exhibits sharp peaks when the Fermi level comes into resonance with electronic quasi-bound states at such defects. Rare in the bulk but abundant at graphene's edges, switchable atomic-scale phonon emitters provide the dominant dissipation mechanism. Our work offers insights for addressing key materials challenges in modern electronics and enables control of dissipation at the nanoscale.
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