On the supersymmetry of the Dirac-Kepler problem plus a Coulomb-type   scalar potential in D+1 dimensions and the generalized Lippmann-Johnson   operator
  We study the Dirac-Kepler problem plus a Coulomb-type scalar potential by generalizing the Lippmann-Johnson operator to D spatial dimensions. From this operator, we construct the supersymmetric generators to obtain the energy spectrum for discrete excited eigenstates and the radial spinor for the SUSY ground state 
D. Martinez, M. Salazar-Ramirez, R. D. Mota and V. D. Granados
hep-th