Tunability of absorption threshold frequencies and Stark shift in the InSb narrow gap spherical quantum layer

Abstract

In this work the interband optical absorption and Stark shift in the ensemble of InSb spherical quantum layers are investigated. Calculations are carried out both for the cases of parabolic and Kane's dispersion laws. The distribution of layers by their inner radii is taken into account. The effect of weak electric field on the energy levels coupling is investigated as well. It is found out that the energy spectrum 1s1p1d2s1f2p… for spherical quantum dot turns to the spectrum 1s1p1d1f2s2p… for spherical quantum layer with enough large value of inner radius. It is also shown that in the spherical quantum layer, where the coupling between neighboring states is not negligible, there is no square low dependence of Stark shift on electric field strength in contrast to the rotator model.