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.

Optical Absorption and Photoluminescence in the Spherical InP/InSb/InP Core/ shell/ shell Nano Structure

“…In this regard, one of the technically realizable and promising for the application of core/shell/shell structures based on InSb is spherically symmetrical composition of InP/InSb/InP [20]. Let us note that in several works the electronic and optical effects are considered via various approximations in single spherical nano layer of InSb [21][22][23]. However, the consideration and quantitative description of electronic states and optical transitions have not performed yet in InSb nano layer, which is a component of real hetero phase InP/InSb/InP structure.…”

Calculation of electrostatic multipoles of electron localized in narrow-band InSb spherical nanolayer

“…From that point of view spherical and cylindrical nanolayers are very suitable systems for controllable manipulation of energy levels of charge carriers located there. Particularly, in contrast to spherical quantum dot (QD), where the only geometrical parameter is QD radius, in case of spherical nanolayer, electrons energy levels can be changed by varying both internal and external system radii [5][6][7]. This circumstance directly reflected in pattern of a sequence of absorption curves for spherical nanolayers [7].…”

“…Particularly, in contrast to spherical quantum dot (QD), where the only geometrical parameter is QD radius, in case of spherical nanolayer, electrons energy levels can be changed by varying both internal and external system radii [5][6][7]. This circumstance directly reflected in pattern of a sequence of absorption curves for spherical nanolayers [7]. Uniqueness of spherical and cylindrical nanolayers is also in the fact, that for small thickness of layer these systems can be considered as a real models for spherical and plain rotators [8,9].…”