Electro- and magneto- optical properties of edge states in bilayer black phosphorene quantum dots

Abstract

We theoretically investigate the electronic and optical properties of stacked bilayer black phosphorus (BBPs) quantum dots (QDs) with three typical BBPs configurations and two AB-stacking with different edge structures, using the tight-binding (TB) method. Our calculation results show that the energy levels can be affected by the different stacking configurations of BBPs. Unlike the monolayer black phosphorus (MBP), the strong inter-layer coupling in AC-stacked BBP and unsymmetrical distribution in AB-stacked BBP will enhance the optical transitions and realize a dark-to-bright transition in the electro and magneto-optical absorption spectra. The coupling strength of the edge states of different configurations is different, resulting in the difference of the properties of the three stacking configurations, which provides a feasible idea for modulating the electronic and optical properties of BBPs.