Figure 10.

Three-dimensional band surfaces in the vicinity of (a) ${\mathbf{\text{k}}}_0=(0.6283,\pi /\sqrt{5})$ for $\rho =\sqrt{5}$, demonstrating a double Dirac-like cone away from a point of symmetry and (b) a triple Dirac-like cone at k₀=X for ρ=2. (Online version in colour.)