A quantum dot device reaches close to optimal thermoelectric efficiency by working with electrons that lever heat.
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Van den Broeck, C. The need for levering heat. Nature Nanotech 13, 876–877 (2018). https://doi.org/10.1038/s41565-018-0210-3
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DOI: https://doi.org/10.1038/s41565-018-0210-3