The effects of cup-like and hill-like parabolic confining potentials on photoionization cross section of a donor in a spherical quantum dot

A theoretical investigation of the effects of hill-like and cup-like parabolic confining electric potentials on photoionization cross section (PCS) in a spherical quantum dot is presented. The hill-like and the cup-like parabolic potentials are superimposed on an infinite spherical square well (ISSW...

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Bibliographic Details
Published in:The European physical journal. B, Condensed matter physics Condensed matter physics, 2016-08, Vol.89 (8), p.1-5, Article 177
Main Author: Tshipa, Moletlanyi
Format: Article
Language:English
Subjects:
Analysis
Complex Systems
Condensed Matter Physics
Cross-sections
Fluid- and Aerodynamics
Photoionization
Physics
Physics and Astronomy
Quantum dots
Regular Article
Solid State Physics
Square wells
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Summary:A theoretical investigation of the effects of hill-like and cup-like parabolic confining electric potentials on photoionization cross section (PCS) in a spherical quantum dot is presented. The hill-like and the cup-like parabolic potentials are superimposed on an infinite spherical square well (ISSW) potential. As the cup-like parabolic potential intensifies, the peak of the PCS becomes redshifted for the s → p transition, and becomes blueshifted for the p → d , d → f (and so forth) transitions. The hill-like parabolic potential, on the contrary, blueshifts peaks of the PCS for s → p transitions, while it redshifts those of transitions between higher states as it intensifies. Consequently, the two potentials discriminate between transitions involving the ground state and those involving higher states.
ISSN:1434-6028
1434-6036
DOI:10.1140/epjb/e2016-60988-6