✍ Scribed by Verónica I. Marconi
No coin nor oath required. For personal study only.
We study numerically the directed motion of vortices (antivortices) under an applied ac bias in two-dimensional Josephson junction arrays (JJA) with an asymmetrically modulated periodic vortex pinning potential. We find that the ratchet effect in large 2D JJA can be obtained using the RSJ model for the overdamped vortex dynamics. The rectification effect shows a strong dependence on vortex density as well as an inversion of the vortex flow direction with the ac amplitude, for a wide range of magnetic field around f = 1/2 (f being the vortex density). Our results are in good agreement with very recent experiments by D.E. Shalo ´m and H. Pastoriza [D.E. Shalo ´m, H.
📜 SIMILAR VOLUMES
We present low frequency voltage noise measurements in SNS Josephson junctions arrays both above and below the Kosterlitz-Thouless transition temperature. For zero applied magnetic field, the magnitude of the noise is found to have a Ž . Ž . maximum at T and the spectral density S f is a Lorentzian