Impurity-induced density ripples in a nodal superconductor carry a vortex whose integer vorticity equals the topological winding difference of the wavefunctions at the two connected nodes, under explicit conditions on the impurity and the STM tip.
The anisotropy enters into the previous winding conditions from the topological winding θKi (r) = θKi (θr) = arctan (αv,Ki tan (wKi θr + ϕi))
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Detecting the topological winding of superconducting nodes via Local Density of States
Impurity-induced density ripples in a nodal superconductor carry a vortex whose integer vorticity equals the topological winding difference of the wavefunctions at the two connected nodes, under explicit conditions on the impurity and the STM tip.