Linear and Nonlinear Optical Properties of Spherical Quantum Dots:Effects of Hydrogenic Impurity and Conduction Band Non-Parabolicity  

作　　者：G.Rezaei B.Vaseghi N.A.Doostimotlagh 

机构地区：[1]Department of Physics,College of Sciences,Yasouj University [2]Young Researchers Club,Yasooj Branch,Islamic Azad University

出　　处：《Communications in Theoretical Physics》2012年第3期485-489,共5页理论物理通讯（英文版）

基　　金：partially supported by the Yasouj University

摘　　要：Simultaneous effects of an on-center hydrogenic impurity and band edge non-parabolicity on intersubband optical absorption coefficients and refractive index changes of a typical GaAs/AlxGa1-xAs spherical quantum dot are theoretically investigated, using the Luttinger-Kohn effective mass equation. So, electronic structure and optical properties of the system are studied by means of the matrix diagonalization technique and compact density matrix approach, respectively. Finally, effects of an impurity, band edge non-parabolicity, incident light intensity and the dot size on the linear, the third-order nonlinear and the total optical absorption coemcients and refractive index changes are investigated. Our results indicate that, the magnitudes of these optical quantities increase and their peaks shift to higher energies as the influences of the impurity and the band edge non-parabolicity are considered. Moreover, incident light intensity and the dot size have considerable effects on the optical absorption coefficients and refractive index changes.

关 键 词：hydrogenic impurity non-parabolic conduction band quantum dots absorption coefficient refractive index 

分 类 号：O431.2[机械工程—光学工程]