Exciton lifetime and emission polarization dispersion in strongly in-plane asymmetric nanostructures

Abstract

The authors investigate theoretically and experimentally epitaxial nanostructures offering a full range of confinement regimes for excitons due to controlled cross-sectional sizes and strong variation in the elongation of the nanosize objects - from strong through intermediate to weak confinement. It is demonstrated that the symmetry breaking leads to significantly slower recombination in one of the bright states of the excitonic fine structure. The respective components are detected in time-resolved decays of unpolarized photoluminescence,which allows a full characterization of the exciton states, including their intrinsic polarization properties.