Fig. 2
From: Double-Gated Nanohelix as a Novel Tunable Binary Superlattice
The four possible superlattice potential configurations with the unit cells highlighted in blue (defined in terms of the dimensionless parameters, see Eq. 3 for the corresponding requirements of the physical parameters, and all with Bg=0.2). a A unary superlattice with degenerate minima and maxima in the unit cell (Ag=C⊥=0). b–d Binary superlattices formed from either b an asymmetric DQW with differing minima and internal reflection symmetry about either minima due to degenerate maxima (Ag=0.1, C⊥=0), c a symmetric DQW with degenerate minima only (Ag=0, C⊥=0.1), or d an asymmetric DQW with differing minima and maxima (Ag=C⊥=0.1)