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

(color online) The optical absorption rate of bilayer phosphorene as function of photon energy. (a) The absorption without strain, (b) and (d) the absorption of x-polarized light under different ϵ z , (c) the absorption of y-polarized light under different ϵ z . The triangle symbols is used to label the sharp peaks of inverse band gaps.