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QI: Fachverband Quanteninformation
QI 11: Quantum Thermodynamics
QI 11.2: Vortrag
Dienstag, 19. März 2024, 09:45–10:00, HFT-TA 441
Role of nonequilibrium fluctuations and feedback in a quantum dot thermal machine — •Juliette Monsel1, Nicolas Chiabrando1,2, Matteo Acciai1, Robert Whitney3, Rafael Sánchez4, and Janine Splettstoesser1 — 1Dept. of Microtechnology and Nanoscience, Chalmers University of Technology, Göteborg, Sweden — 2École Normale Supérieure de Lyon, Lyon, France — 3Université Grenoble Alpes, CNRS, LPMMC, Grenoble, France — 4Universidad Autónoma de Madrid, Madrid, Spain
Steady-state thermoelectric engines can be operated using various resources, including information and nonequilibrium resources, even without any average particle or energy flow from the resource into the working substance. In those cases, fluctuations in the currents clearly play a key role in the performance of the engine. We study a three-quantum dot setup in which one dot is coupled to two electronic reservoirs at different chemical potentials (the working substance) while the other two dots are in contact with a hot reservoir and a cold reservoir respectively (the resource). The temperature difference between these two reservoirs creates nonequilibrium conditions in the resource allowing for work production in the form of a steady-state current against the potential bias in the working substance. Simultaneously, the capacitive coupling between the dots creates an autonomous feedback mechanism which can participate in the work extraction and be interpreted as an autonomous Maxwell demon scheme. We investigate the respective roles of the information flow and nonthermal fluctuations in the performance of this engine.
Keywords: quantum dot; heat engine; Maxwell demon; quantum thermodynamics; quantum transport