1204.5020 (Milton E. Peña-Aza)

Dynamics of a suspended nanowire driven by an ac Josephson current in an
inhomogeneous magnetic field    [PDF]

Milton E. Peña-Aza

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 present different regimes depending on the degree of inhomogeneity of the magnetic field: time independent, periodic and chaotic. Transitions between these regimes are also discussed.

View original: http://arxiv.org/abs/1204.5020