Effects of spin on the dynamics of the 2D Dirac oscillator in the   magnetic cosmic string background
  In this work the dynamics of a 2D Dirac oscillator in the spacetime of a magnetic cosmic string is considered. It is shown that earlier approaches to this problem have neglected a $\delta$ function contribution to the full Hamiltonian, which comes from the Zeeman interaction. The inclusion of spin effects leads to results which confirm a modified dynamics. Based on the self-adjoint extension method, we determined the most relevant physical quantities, such as energy spectrum, wave functions and the self-adjoint extension parameter by applying boundary conditions allowed by the system. 
Fabiano M. Andrade and Edilberto O. Silva
hep-th math-ph math.MP quant-ph