Linear and nonlinear optical absorption coefficients in GaAs/Ga1−xAlxAs concentric double quantum rings: Effects of hydrostatic pressure and aluminum concentration

The linear and nonlinear intra-band optical absorption coefficients in GaAs/Ga1−xAlxAs two-dimensional concentric double quantum rings are investigated. Taking into account the combined effects of hydrostatic pressure and aluminum concentration the energies of the ground (n=1,l=0) and the first exci...

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Bibliographic Details
Published in:Journal of luminescence Vol. 134; pp. 594 - 599
Main Authors: Baghramyan, H.M., Barseghyan, M.G., Kirakosyan, A.A., Restrepo, R.L., Duque, C.A.
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 01.02.2013
Elsevier
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Hydrostatic pressure
Nonlinear optical properties
Nonlinear optics
Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of bulk materials and thin films
Optical susceptibility, hyperpolarizability
Optics
Physics
Quantum ring
Quantum ring
Hydrostatic pressure
Nonlinear optical properties
Gallium arsenides
Inorganic compounds
Optical transition
Quantum effect
Excited states
Effective mass model
Absorption coefficients
Optical properties
Transfer matrix method
Absorption spectra
Nonlinear optics
Intraband transitions
III-V semiconductors
ISSN:0022-2313, 1872-7883
Online Access:Get full text
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Summary:The linear and nonlinear intra-band optical absorption coefficients in GaAs/Ga1−xAlxAs two-dimensional concentric double quantum rings are investigated. Taking into account the combined effects of hydrostatic pressure and aluminum concentration the energies of the ground (n=1,l=0) and the first excited state (n=2,l=1) have been found using the effective mass approximation and the transfer matrix formalism. The energies of these states and the corresponding threshold energy of the intra-band optical transitions are examined as a function of hydrostatic pressure and aluminum concentration for different sizes of the structure. We also investigated the dependencies of the linear, nonlinear, and total optical absorption coefficients as functions of the incident photon energy for different values of hydrostatic pressure, aluminum concentration, sizes of the structure, and incident optical intensity. Its is found that the effects of the hydrostatic pressure and the aluminum concentration lead to a shifting of the resonant peaks of the intra-band optical spectrum. ► Linear and nonlinear intra-band absorption in quantum rings. ► Threshold energy strongly depends on the hydrostatic pressure. ► Threshold energy strongly depends on the stoichiometry and sizes of structure. ► Optical absorption is affected by the incident optical intensity.
ISSN:0022-2313
1872-7883
DOI:10.1016/j.jlumin.2012.07.024