Vortex Harmonic Spinors on the Nappi-Witten Space

We establish a correspondence between vortex equations on flat Riemann surfaces and harmonic spinors on the Nappi–Witten space, the group manifold of a central extension of the Euclidean group $SE(2)$. Vortex configurations lift naturally to this setting, producing explicit solutions of a twisted Dirac equation. Using the conformal flatness of the Nappi–Witten metric, these solutions induce harmonic spinors on four-dimensional Minkowski space. This yields a geometric construction of Abelian magnetic zero-modes on flat Minkowski spacetime from vortex data.