Garaud Julien, Babaev Egor
Department of Theoretical Physics and Center for Quantum Materials KTH-Royal Institute of Technology, Stockholm, SE-10691 Sweden.
Sci Rep. 2015 Dec 3;5:17540. doi: 10.1038/srep17540.
Chiral p-wave superconducting state supports a rich spectrum of topological excitations different from those in conventional superconducting states. Besides domain walls separating different chiral states, chiral p-wave state supports both singular and coreless vortices also interpreted as skyrmions. Here, we present a numerical study of the energetic properties of isolated singular and coreless vortex states as functions of anisotropy and magnetic field penetration length. In a given chiral state, single quantum vortices with opposite winding have different energies and thus only one kind is energetically favoured. We find that with the appropriate sign of the phase winding, two-quanta (coreless) vortices are always energetically preferred over two isolated single quanta (singular) vortices. We also report solutions carrying more flux quanta. However those are typically more energetically expensive/metastable as compared to those carrying two flux quanta.
手性p波超导态支持一系列丰富的拓扑激发，这些激发不同于传统超导态中的激发。除了分隔不同手性态的畴壁外，手性p波态还支持奇异涡旋和无核涡旋，它们也被解释为斯格明子。在这里，我们给出了孤立奇异涡旋态和无核涡旋态的能量性质作为各向异性和磁场穿透长度函数的数值研究。在给定的手性态中，具有相反缠绕的单量子涡旋具有不同的能量，因此在能量上只有一种是有利的。我们发现，在相位缠绕具有适当符号的情况下，两量子（无核）涡旋在能量上总是比两个孤立的单量子（奇异）涡旋更受青睐。我们还报告了携带更多磁通量子的解。然而，与携带两个磁通量子的解相比，这些解通常在能量上更昂贵/更不稳定。
