Decomposition of a unit quantum and isolation of a fractional quantum by an externally injected soliton in an ultra-thin superconducting bi-layer film

An ultra-thin superconducting bi-layer is an artificial multi-component superconductor in which the magnetic flux can be fractionally quantized. The fractionally quantized state is energetically unfavorable, so it is difficult to realize experimentally. We propose a new method to create fractional quantized states by the reaction of a unit quantized state with an externally injected inter-layer phase-difference soliton. Simulation shows that the unit quantized state splits the soliton and the soliton fragments produce fractional quanta by dissociation of the unit quantum.