Conduction band non-parabolicity effect on the optical absorption coefficient and refractive index changes of spherical quantum dots

• Published in: Physica. B, Condensed matter Vol. 406; no. 8; pp. 1488 - 1491
• Main Authors: Rezaei, G., Vahdani, M.R.K., Vaseghi, B.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 01.04.2011; Elsevier
• Subjects: Absorption coefficient; Condensed matter; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Conduction band; Eigenvalues; Exact sciences and technology; Gallium arsenide; Iii-v semiconductors; Mathematical analysis; Non-parabolic conduction band; Nonlinear optical properties; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of specific thin films; Physics; Quantum dots; Refractive index; Refractivity; Quantum dots; Non-parabolic conduction band; Nonlinear optical properties; Gallium arsenides; Interband transitions; Refractive index; Aluminium Gallium Arsenides Mixed; Density matrix; Eigenfunctions; Effective mass model; Absorption coefficients; Eigenvalues; Spherical particle; Non linear effect
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2011.01.053

Optical absorption coefficients and refractive index changes associated with intersubband transition in typical GaAs / Al x Ga 1 − x As spherical quantum dots are theoretically investigated, both in the presence and in the absence of the conduction band non-parabolicity effect. In this regard, the effect of band non-parabolicity on the eigenvalues and eigenfunctions of the dot has been performed using the Luttinger–Kohn effective mass equation. Also, by means of the compact-density-matrix approach the linear and nonlinear optical absorption coefficients and refractive index changes have been calculated. The results show that magnitudes of these quantities are decreased and the peaks are shifted to the lower energies as the influence of band non-parabolicity is considered.