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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Vydáno v:	Journal of luminescence Ročník 134; s. 594 - 599
Hlavní autoři:	Baghramyan, H.M., Barseghyan, M.G., Kirakosyan, A.A., Restrepo, R.L., Duque, C.A.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Amsterdam Elsevier B.V 01.02.2013 Elsevier
Témata:	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
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Popis
Shrnutí:	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