Abstract
In this article we discuss the Dirac equation in the presence of an attractive cylindrical δ-shell potential V(ρ)=-aδ(ρ-ρ_0), where ρis the radial coordinate and a>0. We present a detailed discussion on the boundary conditions the wave function has to satisfy when crossing the support of the potential, proceeding then to explore the dependence of the ground state on the parameter a, analyzing the occurrence of supercritical effects. We also apply the Foldy-Wouthuysen transformation, discussing the non-relativistic limit of this problem.
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