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.
Since the chiral symmetry has many different physical realizations, the interpretation of scattering preference should be done for a given system
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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.