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Fig. 5 | Nanoscale Research Letters

Fig. 5

From: Double-Gated Nanohelix as a Novel Tunable Binary Superlattice

Fig. 5

Square of the dimensionless momentum operator matrix element between the gth and fth subbands in the first Brillouin zone as a function of the dimensionless wave vector q of the electrons photoexcited by linearly z-polarized radiation and for a variety of parameter combinations spanning the first incident of resonance. The different blue curves keep Ag=0.5 and C=0 fixed and vary Bg=0.1, 0.2, and 0.3 corresponding to dot-dashed, dashed, and solid. The different red curves keep Bg=0.3 and C=0 fixed while varying Ag=0.05, 0.1 and 0.3 as dot-dashed, dashed, and solid, while the dotted blue (dotted red) plots the limiting case Ag=0.5 & Bg→0 (Ag→0 & Bg=0.3). a Transitions between the ground and first bands. The inset plots the behaviour for fixed Ag=0.5 and changing Bg crossing the resonant condition at Bg=0.25 (see text) in a reduced q-range, ranging from upper blue Bg=0.245, lower blue Bg=0.249, upper purple Bg=0.251, to lower purple Bg=0.255. The dashed green curves are for small non-zero transverse field C=0.05 ranging from Bg=0.245 (upper curve) to Bg=0.255 (lower curve) in increments of 0.05. b Plots transitions between the ground and second bands, the inset plots the behaviour close to resonance when Ag=0.5; blue is Bg=0.249, purple is Bg=0.251, and dark green is at resonance with C=0.05. c Plots transitions between the first and second bands, the parameters for the inset are the same as those in (b)

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