Creation and Annihilation of Fluxons in ac���driven Semi-annular Josephson Junction

A new geometry (semiannular) for Josephson junction has been proposed and theoretical studies have shown that the new geometry is useful for electronic applications [1, 2]. In this work we study the voltage���current response of the junction with a periodic modulation. The fluxon experiences an oscillating potential in the presence of the ac���bias which increases the depinning current value. We show that in a system with periodic boundary conditions, average progressive motion of fluxon commences after the amplitude of the ac drive exceeds a certain threshold value. The analytic studies are justified by simulating the equation using finite���difference method. We observe creation and annihilation of fluxons in semiannular Josephson junction with an ac���bias in the presence of an external magnetic field.