Dynamics of a pair of half-Integer quantum vortices

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The motion of quantum vortices, i.e. quantized eddy currents, governs most phenomena in supercoducting systems. If the quantum vortices form a pair, a kind of artificial molecule will be realized. In this study, we proposed superconductor/ ferromagnet/superconductor transmission lines and one-dimensional superconducting quantum interference devices as candidates to realize such quantum-vortex pairs, and elucidated details of the dynamics of quantum-vortex pairs. It is found that we can control the dynamics of quantum-vortex pairs using domain structures in the ferromagnetic layer and ratchet effects. These results would open a possibility of novel quantum devices.