Abstract
This paper deals with the approximation of a magnetic Schrödinger operator with a singular δ -potential that is formally given by (i∇+A)2 + Q + αδΣ by Schrödinger operators with regular potentials in the norm resolvent sense. This is done for Σ being the finite union of C2 -hypersurfaces, for coefficients A, Q, and α under almost minimal assumptions such that the associated quadratic forms are closed and sectorial, and Q and α are allowed to be complex-valued functions. In particular, Σ can be a graph in R2 or the boundary of a piecewise C2 -domain. Moreover, spectral implications of the mentioned convergence result are discussed.