Fluxon interaction with the finite-size dipole impurity

Publication date: Available online 29 January 2019Source: Physics Letters AAuthor(s): Ivan O. Starodub, Yaroslav ZolotaryukAbstractInteraction of the fluxon with the finite size dipole impurity in the long Josephson junction is investigated. The impurity has polarity and will be referred to as a dipole impurity because it also has a direction and, consequently, changes its sign under the space inversion transform x→−x. Such a model is used to describe the inductively coupled to the Josephson transmission line qubit and the misaligned Abrikosov vortex that penetrates into the long Josephson junction. We derive the approximate equations of motion for the fluxon centre of mass and its velocity. With the help of these equations we demonstrate that pinning and scattering of the fluxon on the impurity differs significantly from the case when the point impurity which is modelled by the derivative of the Dirac's δ-function.

Source: Physics Letters A - January 30, 2019 Category: Physics Source Type: research