Search for in-phase Josephson vortex solutions in BSCCO type junctions: modelling and numerical simulations

The Josephson fluxon behaviour in layered BSCCO-type single crystals is modelled by coupled long Josephson junctions described by coupled sine–Gordon equations. Among all the possible solutions, particularly interesting are the so-called in-phase fluxon solutions with coherent motion of all the fluxons.

Recently, generation of electromagnetic waves at almost terahertz (THz) frequencies in BSCCO single crystals was reported. In order to maximize the power of such generation, these in-phase fluxon solutions are essential. Two different avenues to obtain in-phase fluxon motion have been suggested, i.e. either using the interaction with a cavity to phase lock the fluxon motion or applying a large magnetic field to create in-phase flux flow solutions.

We have numerically considered both mechanisms. The results provide an understanding of the system and a guidance to experimentalists looking for THz generation in BSCCO.