Phonon induced suppression of the Zeeman splitting in polar semiconductor quantum dots: A quantum size effect

Abstract

The effect of the electron-phonon interaction on the Zeeman splitting of the first excited level of a two-dimensional parabolic quantum dot is studied using the nondiagonal Hartree-Fock variational approximation within the framework of Green's function formalism for the entire range of the electron-phonon interaction strength and arbitrary confinement length. The results are applied to GaAs and CdS quantum dots and it is shown that polaronic interaction can cause a strong size-dependent suppression of the Zeeman splitting in these dots if their sizes are made sufficiently small.