Dirac particle in Aharonov-Bohm-Coulomb field: Path integral treatment

Exact Green's function related to a Dirac particle submitted to the combination of Aharonov-Bohm and Coulomb potentials in (2 + 1) coordinate space is analytically calculated via path integral formalism. The Pauli matrices which describe the spin dynamics are replaced by two fermionic oscillators via the Schwinger model. The energy spectrum as well as the corresponding normalized wave functions are extracted following this approach. The interesting properties of the spinors are thus deduced after symmetrization. According to the symmetric form for Green's function, it is shown that the non-relativistic limit of the Dirac particle is undertaken with much ease.