Fig. 1
From: Double-Gated Nanohelix as a Novel Tunable Binary Superlattice
Diagram of the system’s geometry and parameters from both face-on and lengthways perspectives. R is the helix radius, and d1 and d2 are the distances of the charged wires from the helix axis with charge densities λ1 and λ2, respectively. The spatial coordinate φ describes the angular position on the helix from face-on and is related to the z-coordinate via φ=2πz/p with p the helix’s pitch. A transverse electric field E⊥ is applied parallel to the y-axis