This work develops an atomistic description of excitonic fine structure in coupled InAs/InP nanowire quantum dots. It shows how interdot coupling and realistic atomistic asymmetry together govern the bright-exciton doublet and polarization response.
Keywords: nanowire quantum dots, InAs/InP, quantum dot molecules, fine-structure splitting
Main result: excitonic fine structure in nanowire quantum-dot molecules is controlled jointly by coupling and atomistic symmetry breaking. A simple single-dot picture is insufficient once realistic molecular coupling is present.