Fig. 3: Hermitian topological transition.
From: Annihilation of exceptional points from different Dirac valleys in a 2D photonic system
Experimental pseudospin texture in S1-S2 plane of lower energy band for the (a) (N + 2, N) case (4 Dirac points, zero winding) and (b) (N, N) case (2 Dirac points, winding 2).
