Dynamics of a pair of half-Integer quantum vortices

量子涡旋的运动，即量子化的涡流，支配着超导系统中的大多数现象。如果量子涡旋形成一对，就会实现一种人造分子。在这项研究中，我们提出了超导体/铁磁/超导传输线和一维超导量子干涉器件作为实现这种量子涡旋对的候选方案，并阐明了量子涡旋对的动力学细节。研究发现，利用铁磁层中的磁畴结构和棘轮效应可以控制量子涡旋对的动力学。这些结果将为开发新的量子器件提供可能性。

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.