Figure 2

Transmittance as a function of the energy for BPGGSLs with \(d_{W1} > d_{W2}\). Different incident angles have been considered: (a) \(\theta =15^{\circ }\), (b) \(\theta =30^{\circ }\), (c) \(\theta =45^{\circ }\) and (d) \(\theta =60^{\circ }\). In all cases the perfect transmission at normal incidence \(\theta =0^{\circ }\) (dashed-red curve) is a manifestation of the Klein tunneling. Here, the superlattice parameters are: \(V_0=0.1\) eV, \(d_B=50a\), \(d_{W1}=60a\), \(d_{W2}=50a\) and \(N=3\).