ETUDE DE L’EFFET DES PARAMETRES STRUCTURAUX SUR LES STRUCTURES DE BANDES DANS LES SUPERRESEAUX QUASIPERIODIQUES AlXGa1-XAs / GaAs

Abstract

This work is to study the effect of the variation of structural parameters on the band structure in the quasiperiodic Fibonacci superlattices AlxGa1-xAs/GaAs using the formalism of the transfer matrix and Airy functions. Ours results show that increasing the width of Fibonacci’s wells af allows to the confinement of subminibands with a widening of minigaps, this causes a consistent and coherent fragmentation. The barrier thickness of Fibonacci bf acts on the width of subminibands by controlling the interaction force between neighboring eigenstates. Its increase gives rise to singularly extended states. The barrier height Fibonacci Vf permit to control the degree of structural disorder in these structures. On the other hand, these phenomena become more significant for quasiperiodic structures dimer of Fibonacci. The variation of these parameters permits the design of laser with modulated wavelength.