  In this paper, we investigate the influence of a screw dislocation on the
energy levels and the wavefunctions of an electron confined in a
two-dimensional pseudoharmonic quantum dot under the influence of an external
magnetic field inside a dot and Aharonov-Bohm field inside a pseudodot. The
exact solutions for energy eigenvalues and wavefunctions are computed as
functions of applied uniform magnetic field strength, Aharonov-Bohm flux,
magnetic quantum number and the parameter characterizing the screw dislocation,
the Burgers vector. We investigate the modifications due to the screw
dislocation on the light interband absorption coefficient and absorption
threshold frequency. Two scenarios are possible, depending on if singular
effects either manifest or not. We found that as the Burgers vector increases,
the curves of frequency are pushed up towards of the growth of it. One
interesting aspect which we have observed is that the Aharonov-Bohm flux can be
tuned in order to cancel the screw effect of the model.
