where d gh , ∆ gh , σ x and σ y are the four topological parameters as described in Ref. 44. d gh denotes the pitch of the cone, ∆ gh is the deviation from cylindrical symmetry and σ x and σ y are the tilts of the cones away from the vertical direction. Here ⃗ g signifies the energy gradient difference vector and ⃗ h is the non-adiabatic coupling vector.