title: Dynamics of a suspended nanowire driven by an ac Josephson current in an inhomogeneous magnetic field.
abstract: We consider a voltage-biased nanoelectromechanical Josephson junction, where a suspended nanowire forms a superconducting weak link, in an inhomogeneous magnetic field. We show that a nonlinear coupling between the Josephson current and the magnetic field generates a Laplace force that induces a whirling motion of the nanowire. By performing an analytical and a numerical analysis, we demonstrate that at resonance, the amplitude-phase dynamics of the whirling movement presents different regimes depending on the degree of inhomogeneity of the magnetic field: time independent, periodic, and chaotic. Transitions between these regimes and attractor merging crisis are also discussed.
authors.affiliation: Department of Physics, University of Gothenburg, SE-412 96 Göteborg, Sweden.
authors.forename: Milton E
authors.initials: ME
authors.lastname: Peña-Aza