Nanomechanics driven by the superconducting proximity effect

We consider a nanoelectromechanical weak link composed of carbon nanotube suspended above trench in normal metal electrode and positioned gap between two superconducting leads. The is treated as movable single-level quantum dot which the position-dependent order parameter induced result Cooper pair tunneling. show that such system, self-sustained bending vibrations can emerge if bias voltage applied. occurrence this effect crucially depends on direction relative position level. also demonstrate strongly affect dc current through characteristic be used for direct experimental observation predicted phenomenon.