Physics Department, University of Massachusetts, Amherst, Massachusetts 01003, USA.
Phys Rev Lett. 2009 Dec 4;103(23):237002. doi: 10.1103/PhysRevLett.103.237002. Epub 2009 Dec 2.
We demonstrate that, in contrast with the single-component Abrikosov vortex, in two-component superconductors vortex solutions with an exponentially screened magnetic field exist only in exceptional cases: in the case of vortices carrying an integer number of flux quanta and in a special parameter limit for half-quantum vortices. For all other parameters, the vortex solutions have a delocalized magnetic field with a slowly decaying tail. Furthermore, we demonstrate a new effect which is generic in two-component systems but has no counterpart in single-component systems: on exactly half of the parameter space of the U(1) x U(1) Ginzburg-Landau model, the magnetic field of a generic fractional vortex inverts its direction at a certain distance from the vortex core.
我们证明了，与单组分 Abrikosov 涡旋相反，在双组分超导体中，只有在特殊情况下才存在具有指数屏蔽磁场的涡旋解：在携带整数磁通量子的涡旋和半量子涡旋的特殊参数极限的情况下。对于所有其他参数，涡旋解具有具有缓慢衰减尾部的非局域磁场。此外，我们还证明了在双组分系统中普遍存在但在单组分系统中没有对应物的一种新效应：在 U(1)xU(1)Ginzburg-Landau 模型的参数空间的恰好一半上，普通分数涡旋的磁场在距涡旋核一定距离处反转其方向。
