Superlattice with multiple layers per period

We have studied the miniband structure of a GaAs-${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Al}}_{\mathrm{x}}$As superlattice consisting of double layers of GaAs and ${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Al}}_{\mathrm{x}}$As materials per period. The variations of widths and gaps of the superlattice minibands are given as functions of the size of the quantum wells in each period; the dependence of the effective energy gap on the size of the quantum wells is also presented.