论文标题
超电流诱导的Weyl超导性
Supercurrent-Induced Weyl Superconductivity
论文作者
论文摘要
我们表明，在非中心旋转轨耦合的超导型超导体中，有限的超电流可引起Weyl超导性。我们在$ d+p $ - 波配对状态下引入了具有有限的质量中心动量的四方超导体的三维紧密结合模型，并阐明了通过施加无限的超级电流来实现点线节点到点节点光谱过渡。我们还澄清说，自旋轨道耦合中的高阶效应对于这种现象尤为重要。点节点受拓扑上非平凡的Weyl电荷保护，因此无间隙弧态出现在超导体的表面上。此外，点节点的位置和WEYL电荷都取决于电流的方向。此外，当考虑到平面内超电流时，在高对称平面上定义的量化浆果相表征了Weyl节点。我们的命题铺平了一种使用外部字段来控制超导间隙结构的新方法。
We show that Weyl superconductivity can be induced by finite supercurrent in noncentrosymmetric spin-orbit-coupled superconductors with line nodes. We introduce a three-dimensional tight-binding model of a tetragonal superconductor in a $D+p$-wave pairing state with a finite center-of-mass momentum, and elucidate that a line-nodal to point-nodal spectral transition occurs by applying an infinitesimal supercurrent. We also clarify that the higher-order effect in spin-orbit coupling is particularly important for this phenomenon. The point nodes are protected by topologically nontrivial Weyl charges, and therefore gapless arc states appear on the surface of the superconductor. Furthermore, both the positions and the Weyl charges of the point nodes depend on the direction of the current. In addition, a quantized Berry phase defined on high-symmetry planes characterizes the Weyl nodes when the in-plane supercurrent is considered. Our proposition paves a new way for controlling the superconducting gap structures by using an external field.
