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MON: Monday Contributed Sessions
MON 23: Poster Session: Fundamental Aspects and Model Systems
MON 23.59: Poster
Monday, September 8, 2025, 18:30–20:30, ZHG Foyer 1. OG
Autonomous conversion of particle exchange to quantum self-oscillations — •Sofia Sevitz1, Federico Cerisola2, Karen Hovhannisyan1, and Janet Anders1,2 — 1University of Potsdam, Germany — 2University of Exeter, UK
Particle-exchange autonomous machines continuously convert electronic transport into heat transfer between fermionic reservoirs. In typical set-ups, to collect the generated electrical power, an external resistive load is connected that inevitably yields some dissipation. To overcome these losses, we couple a mechanical resonator as an internal degree of freedom to the particle exchange machine hosted in a quantum dot. This way, part of the exchanged energy can be converted into self-oscillations. Here we explore the slow transport regime making use of a recently developed quantum model. Our analysis goes well beyond all previous work, which was limited to semiclassical treatment of the fast transport regime. First, we show that quantum self-oscillations are present in this slow regime and can be measured via the electrical particle current acting as a witness. Next, we study the thermodynamics of the setup and find that, under realistic conditions, self-oscillations occur only when the machine operates as a heater. Lastly, we establish an experimentally measurable performance metric which reveals that, counterintuitively, strong coupling between dot and resonator is detrimental to the conversion quality. The framework developed in this work can be readily implemented in a variety of nanoscale devices such as a suspended carbon nanotube with an embedded quantum dot.
Keywords: Electromechanical coupling; Quantum Thermodynamics; Autonomous machine; Quantum dot