Figure 4

Transmission bands of BPGGSLs in which transparent states are clearly manifested. (a) and (b) correspond to electron transmission bands, while (c) and (d) to hole transmission bands. The resonance associated to the transparent state is indicated with the dashed-blue vertical arrow. The angle of incidence in all cases is \(\theta =45^{\circ }\). The superlattice parameters of (a) and (c) are the same as in Fig. 2 and the ones of (b) and (d) are the same as in Fig. 3.