Chaotic behavior in coupled superconducting weak links

Magnetically controlled superconducting weak links

We have designed and characterized a magnetic template which can be switched between chains of parallel and antiparallel field distribution by applying an in-plane magnetic field. The parallel field profile creates highly mobile vortex channels in a superconducting film deposited on top, reproducing the behavior of a weak link as evidenced by the presence of Shapiro steps in the current-voltage...

Current-voltage characteristics of semiconductor-coupled superconducting weak links with large electrode separations

We have studied the current-voltage characteristics of superconducting weak links in which the coupling medium is the two-dimensional electron gas in InAs-based semiconductor quantum wells, with relatively large ~typically 0.5 mm! separations between niobium electrodes. The devices exhibit Josephson-like current-voltage characteristics; however, the falloff of the differential resistance with d...

Subharmonic energy-gap structure in superconducting weak links.

Weak Synchronization of Chaotic Coupled Map Lattices

Phase synchronized states can emerge in the collective behavior of an ensemble of chaotic coupled map lattices, due to a mean field interaction. This type of interaction is responsible for synchronized chaotic global activity of the lattices, while the local activity of each map remains unsynchronized. The resulting collective dynamics is called “weak synchronization.” The transition to such a ...

Charge and Spin Transport in Superconducting Weak Links

The coherent mixing of the current states in the superconducting weak link subject to a Josephson phase difference φ and subject to an external transport current in the banks is one of the aims of this work. At φ = π the nonlocal mixing of current states produces two vortices close to the point-contact between superconducting bulks. The effect of point-contact reflection in an impenetrable inte...