Figure 1.

Schematic representation of a SL band structure used in this study. Minibands for heavy hole levels, ε_hh,1 , minigaps, subbands, and Fermi level, E_F, are shown. The zero of energy was considered at the top of the Coulomb potential at the barrier. Horizontal dashed lines indicate the bottom of the first miniband and the top of the second miniband, respectively.