Fig. 3
From: Double-Gated Nanohelix as a Novel Tunable Binary Superlattice
Band structure for double-gated nanohelix system for various combinations of the dimensionless parameters (with Bg=0.4 fixed throughout): a Solid blue (dashed red) plots Ag=0 & C⊥=0 (Ag=0.2 & C⊥=0), the inset additionally plots the behaviour of the bottom two subbands subject to the transverse electric field with Ag=0 & C⊥=0.2 as the dot-dashed green curve. b Solid blue (dashed red) plots Ag=0.63 & C⊥=0 (Ag=0.8 & C⊥=0) where the blue curve depicts the first incident of resonance (see text) with energy bands crossing at the centre of the Brillouin zone, the inset compares the behaviour of the bottom excited two subbands with the case where Ag=0.63 & C⊥=0.2 as the dot-dashed green curve. c Solid blue (dashed red) plots Ag=1.26 & C⊥=0 (Ag=1.5 & C⊥=0) where the blue curve depicts the second incident of resonance with energy gaps closing at the edge of the Brillouin for higher bands. d The third resonance and higher subband minigaps close at the centre, with solid blue (dashed red) being Ag=1.9 & C⊥=0 (Ag=2.2 & C⊥=0). The unit cell shapes are sketched, n enumerates the bands, and the axis of the insets are the same as the main graphs