Pauli Hamiltonians with an Aharonov-Bohm Flux

We study a two-dimensional Pauli operator describing a charged quantum particle with spin $1\mathrm{/}2$ moving on a plane in presence of an orthogonal Aharonov-Bohm magnetic flux. We classify all the admissible self-adjont realizations and give a complete picture of their spectral and scattering properties. Symmetries of the resulting Hamiltonians are also discussed, as well as their connection with the Dirac operator perturbed by an Aharonov-Bohm singularity.