Effect of magnetic field on optical anisotropy of CdZnSe quantum dots

Abstract

The effect of magnetic field on the electronic structure and optical anisotropy of Zn1-xCdxSe/ZnSe quantum dots (QDs) has been analyzed for varying geometrical confinement related to the in-plane asymmetry. The disk-shaped QD is modeled by anisotropic parabolic potential with the magnetic field considered in Faraday geometry. The multiple band Hamiltonian in presence of magnetic field has been numerically diagonalized using appropriate basis functions and coordinate transformations for fast convergence. The eigenvalues and eigenvectors thus obtained are utilized for obtaining the dipole matrix elements. Hence, the photoluminescence spectra and the degree of linear polarization have been studied for the anisotropic QDs. The polarization degree is found to increase with magnetic field and anisotropy parameter. © 2010 IOP Publishing Ltd.