Intra-miniband absorption coefficient in GaAs/Al^sub x^Ga^sub 1-x^As core/shell spherical quantum dot

In this work we reported the theoretical calculations of the absorption coefficient in a GaAs/AlxGa1-xAs core/shell spherical quantum dot as a function of the aluminium concentration x in the direct band-gap regime, and core and shell size (inner radius r1, and the external one r2). The effective ma...

Full description

Saved in:
Bibliographic Details
Published inJournal of alloys and compounds Vol. 736; p. 211
Main Authors Rodríguez-Magdaleno, KA, Perez-Álvarez, R, Martínez-Orozco, JC
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier BV 05.03.2018
Subjects
Absorptivity
Alloys
Aluminum
Band gap
Coefficients
Electron states
Electronic structure
Gallium arsenide
Mathematical analysis
Quantum dots
Spherical shells
Online AccessGet full text

Cover

More Information
Summary:In this work we reported the theoretical calculations of the absorption coefficient in a GaAs/AlxGa1-xAs core/shell spherical quantum dot as a function of the aluminium concentration x in the direct band-gap regime, and core and shell size (inner radius r1, and the external one r2). The effective mass approximation and the hybrid matrix method were used to calculate the electronic structure of the system. The considered optical absorption transition is between the 1s and 1p electronic states. We found that the computed absorption coefficient experiences a red- and blue-shift as the considered parameters change. The intra-miniband formation is generated by means of the overlap of the absorption coefficient considered in a distribution of the GaAs/AlxGa1-xAs core/shell spherical quantum dots with different core and shell sizes. Based on the obtained results, we proposed that the better way to form an intra-miniband is to consider a GaAs/AlxGa1-xAs core/shell spherical quantum dot with different values on the inner radius instead of increase the external radius value.
ISSN:0925-8388
1873-4669