The WKB method for the Dirac equation with vector-scalar potentials in 2+1 and 3+1 dimensions
Abstract:
The recurrent scheme of deriving WKB-expansions for the Dirac equation
with arbitrary central-symmetrical scalar and vector potential of a barrier
type in two and three spatial dimensions is developed. The relativistic
analog of the Bohr-Sommerfeld quantization condition and the general analytical
expression for decay width of a quasistationary state are obtained. On
the example of spherical model of the Stark effect the quasistationary
spectrum of relativistic two- and three-dimensional hydrogen-like atoms
(ions) in the external central-symmetrical field is found. Influences of
the relativistic effects and spatial dimensionality on the position and
width of quasistationary levels are investigated.