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(Color online) Crystal structures of undoped superlattice (configuration A) and Mg modulation-doped superlattice (configuration B).
(Color online) Projected densities of states for individual bilayers in configurations A (a) and B (b). The abscissa axis is the positions of the individual bilayers arranged along the  direction, the ordinate axis is the energy, and the gray level represents the values of PDOS. The dash curves are guides for the eyes.
(Color online) (a) Partial charge density profiles for VBM (solid lines) and CBM (dash lines). The insets show the schematic band alignments of type-I and type-II SLs. (b) Planar-average electrostatic potentials along the  direction in configurations A and B. The dashed lines represent the average values of electrostatic potentials in different layers. The dash-dotted line in (a) and (b) indicates the position of the interface.
(Color online) Site-decomposed DOS in layers of configurations A and B.
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