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A Single-Molecule Quantum Heat Engine
Serhii Volosheniuk (Delft University of Technology), Riccardo Conte (Delft University of Technology), Eugenia Pyurbeeva (Hebrew University of Jerusalem, Fritz Haber Institute of the Max Planck Society), Thomas Y. Baum (Delft University of Technology), Manuel Vilas‐Varela (Universidade de Santiago de Compostela, Centro Singular de Investigación en Química Biológica y Materiales Moleculares), Saleta Fernández (Universidade de Santiago de Compostela, Centro Singular de Investigación en Química Biológica y Materiales Moleculares), Diego Peña (Universidade de Santiago de Compostela, Axencia Galega de Innovacion), Herre S. J. van der Zant (Delft University of Technology), Pascal Gehring (UCLouvain)
Abstract: Particle-exchange heat engines operate without moving parts or time-dependent driving, relying solely on static energy-selective transport. Here, we realize a particle-exchange quantum heat engine based on a single diradical molecule, which is only a few nanometers in size. We experimentally investigate its operation at low temperatures and demonstrate that both the power output and efficiency are significantly enhanced by Kondo correlations, reaching up to 53% of the Curzon-Ahlborn limit. These results establish molecular-scale particle-exchange engines as promising candidates for low-temperature applications where extreme miniaturization and energy efficiency are paramount.