Impurity-related photoionization cross section in a pyramid-shaped quantum dot: Intense laser field and hydrostatic pressure effects

• Published in: Physica. E, Low-dimensional systems & nanostructures Vol. 63; pp. 105 - 113
• Main Author: Niculescu, E.C.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.09.2014; Elsevier
• Subjects: Applied sciences; Cross-disciplinary physics: materials science; rheology; Electronics; Exact sciences and technology; Hydrostatic pressure; Laser field; Materials science; Molecular electronics, nanoelectronics; Nanocrystalline materials; Nanoscale materials and structures: fabrication and characterization; Photoionization cross section; Physics; Quantum dot; Quantum dots; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Laser field; Photoionization cross section; Quantum dot; Hydrostatic pressure; Pressure effects; Cross section; Quantum dots; Doping; High pressure; Quantum dot lasers; Spatial distribution; Photoionization; Binding energy; Wave functions; Effective mass; Nanostructured materials; Cross sections
• ISSN: 1386-9477; 1873-1759
• DOI: 10.1016/j.physe.2014.05.012

Within the effective mass approximation the binding energy and photoionization cross section of a donor impurity in a pyramid shaped quantum dot under simultaneous action of the hydrostatic pressure and high-frequency laser field have been investigated. We found that: (i) the variation of the binding energy reflects the spatial distribution of the impurity wave function, which is significantly modified by the laser radiation; (ii) the photoionization cross section and resonant peak magnitude depend on the donor position, laser field intensity and pressure. The localization of resonant peak maxima in the doping planes and their dependence on external perturbations are systematically investigated. •Laser field effect on the binding energy in a pyramid-shaped nanodot is studied.•Photoionization cross-section strongly depends on the impurity position.•For large laser intensities the resonant peak position is red-shifted.•Hydrostatic pressure blue-shifts the resonant peak and increases its magnitude.