Double band-inversions of bilayer phosphorene under strain and their effects on optical absorption
He Shi, Yang Mou, Wang Rui-Qiang
       

Band structure of armchair-edged [panels (a)–(d)] and zigzag-edged [panels (e)–(h)] bilayer phosphorene ribbons for different values of ϵ z . The number of unit cells in lateral direction is 50 for both armchair and zigzag ribbons.