Optical properties of quantum dashes

摘要

There are presented optical properties of strongly in-plane elongated nanostructures - the so called quantum dashes - made in InAs/InP material system by molecular beam epitaxy. They have been investigated systematically by a spectroscopic manner on both the entire ensemble and on the single dash level. Their properties are discussed with respect to the fundamental electronic and optical properties as the polarization of emission, exciton fine structure splitting, biexciton binding energy, the characteristic exciton to biexciton lifetimes ratio and exciton decoherence via interaction with acoustic phonons. The experimental results are analyzed supported by previous energy level calculations within the eight-band k·p theory and the rate equation modeling of the exciton kinetics.