Polarization of optical radiation of polaron exciton in anisotropic quantum dots

The theory of a large radius polaron in the ellipsoidal quantum dot is developed. The optical spectrum of the polaron exciton is investigated for different levels of the anisotropy of the quantum dot. It is shown that the ground state of the polaron corresponds the anisotropic polarization of the medium. The symmetry of the wave function of the ground state depends on the semiconductor band parameters and on the quantum dot shape. The conditions providing a strong polarization of the emission radiation are found. The possible degrees of the phononless line polarization for different relations between the polaron energy and the exchange interaction energy are obtained