Fig. 3: Dispersion of the triangular lattice wrapped in a (4,−1) chiral tube.
From: Multidimensional synthetic chiral-tube lattices via nonlinear frequency conversion
a Colour density plot of the propagation constant β vs. wave numbers k1 and k2, where the (4,−1) chiral periodic boundary condition allows only k1,k2 values on the white lines. Here, we set C1 = C3 = C4 = 1. b The corresponding dispersion of a plotted in 1D along k1 = k2/4. c, d Plots analogous to a, b but with a complex coupling C4 = i; the other parameters are the same
