Nitride Quantum Dot-in-Wire Structures with Deeper Confinement for Use in Non-Classical Light Generation

We report the calculation of fine-structure splitting (FSS) in four nitride quantum dot-in-wire devices for use in entangled photon pair generators (EPPG). For reliable operations, such non-classical photon generators must feature a vanishingly small FSS. In our recent work on InGaN/GaN systems, it was found that the non-polar m-plane structures exhibit a small FSS (in the range of 10 μeV) compared to the polar counterparts. In this work, we investigate design improvements via tuning the confinement potential. For the numerical simulation, a multiscale many-body framework is employed, where the excitonic energy is calculated by coupling a full configuration interaction (FCI) method with an atomistic multi-band tight-binding (TB) model.