Voltage rectification in two dimensional Josephson junction arrays

TL;DR

This paper demonstrates voltage rectification in two-dimensional Josephson junction arrays through numerical simulations, revealing vortex flow control dependent on vortex density and ac amplitude, aligning with recent experimental findings.

Contribution

It introduces a numerical study of vortex ratchet effects in 2D Josephson junction arrays using the RSJ model, highlighting the dependence on vortex density and ac amplitude.

Findings

Rectification depends strongly on vortex density.

Vortex flow direction can invert with ac amplitude.

Results agree with recent experimental observations.

Abstract

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 high magnetic field around f=1/2 (f being the vortex density). Our results are in good agreement with very recent experiments by D.E. Shalom and H. Pastoriza [Phys. Rev. Lett. 94, 177001, (2005)].