Abstract In this paper we continue earlier investigations regarding the approximation of Dirac operators with δ -shell potentials in the norm resolvent sense. In particular, we consider the approximation of Dirac operators with confining electrostatic and Lorentz scalar δ -shell potentials, where the support of the δ -shell potentials is impermeable to particles modelled by such Dirac operators.
Christian Stelzer‐Landauer (Wed,) studied this question.