Articles you may be interested inPhotoluminescence studies on self-organized 1.55-m InAs/InGaAsP/InP quantum dots under hydrostatic pressure J. Appl. Phys. 116, 023510 (2014); 10.1063/1.4890013Exciton and biexciton dynamics in single self-assembled InAs/InGaAlAs/InP quantum dash emitting near 1.55m

We present experimental and theoretical investigation of exciton recombination dynamics and the related polarization of emission in highly in-plane asymmetric nanostructures. Considering general asymmetry-and size-driven effects, we illustrate them with a detailed analysis of InAs/AlGaInAs/InP elongated quantum dots. These offer a widely varied confinement characteristics tuned by size and geometry that are tailored during the growth process, which leads to emission in the application-relevant spectral range of 1.25-1.65 µm. By exploring the interplay of the very shallow hole confining potential and widely varying structural asymmetry, we show that a transition from the strong through intermediate to even weak confinement regime is possible in nanostructures of this kind. This has a significant impact on exciton recombination dynamics and the polarization of emission, which are shown to depend not only on details of the calculated excitonic states but also on excitation conditions in the photoluminescence experiments. We estimate the impact of the latter and propose a way to determine the intrinsic polarization-dependent exciton light-matter coupling based on kinetic characteristics.

Articles you may be interested inTelecom-wavelength (1.5μm) single-photon emission from InP-based quantum dots Single photon emission in the red spectral range from a GaAs-based self-assembled quantum dot Appl. Phys. Lett. 101, 103108 (2012); 10.1063/1.4750241Exciton fine structure and biexciton binding energy in single self-assembled In As ∕ Al As quantum dots