In this study, one band Schrödinger equation for InAs/GaAs quantum dots coupled to their wetting layer was
solved numerically by using a finite element method (FEM). We have carried out the conduction of the
Woods–Saxon (WS) potential in the quantum dots (QDs) as well as a constant finite barrier between InAs
quantum dot/wetting layer and GaAs matrix is considered for comparison. It is found by WS potential that the
envelope functions never become completely localized inside the dot; therefore this delocalization leads to
strong alternations in absorption and dispersion profiles which is not negligible. Also, it is found that group
velocity is affected by the WS potential and reveals remarkable blue-shift in comparison to the constant finite
potential.