Solution of the Dirac Equation with Special Hulthén Potentials

The Dirac equation for the special case of spinor in the relativistic potential with the even and odd components related by a constraint is solved exactly when the even component is chosen to be the Hulthen potential.The corresponding radial wavefunctions for two-component spinor are obtained in terms of the hypergeonetric function,and the energy spectrum of the bound states is obtained as a solution to a given equation by boundary constrants,in which the nonrelativistic limit reproduces the usual Hulthen potential.