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arXiv · 2604.10041

Adiabatic self-vibrations of a movable Cooper-pair box generated by inelastic Andreev tunneling

Sunghun Park·Anton V. Parafilo·Leonid Y. Gorelik·Robert I. Shekhter
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Abstract

Self-sustained oscillators produce stable periodic motion robust to dissipation. Such motion is usually achieved by work fed back into the oscillator, but its performance is often limited by frequency-dependent operation. Here we propose a scheme for self-sustained vibrations without external feedback. We consider a movable Cooper-pair box attached to the free end of a voltage-biased normal-metal pillar. The Cooper-pair box carries an Andreev current subject to an electric field applied perpendicular to the current. In the adiabatic limit, where the Cooper-pair box state follows its motion, vibrational instability occurs, pumped by inelastic Andreev tunneling. Nonlinearity of the Josephson coupling saturates the vibrational amplitude, resulting in two-dimensional self-vibrations. We discuss the advantage of this adiabatic scheme in comparison with feedback-induced self-oscillation.

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Sunghun Park, Anton V. Parafilo, Leonid Y. Gorelik, Robert I. Shekhter. 2026-04-11. Adiabatic self-vibrations of a movable Cooper-pair box generated by inelastic Andreev tunneling. https://arxiv.org/abs/2604.10041

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