Fig. 3: Surface Fermi arcs from the real higher-order Weyl points.

a Experimental setup. The field distributions are measured on the (100) sample surface covered by a metallic layer. b Schematic of the 2D surface BZ. The right inset shows measured results obtained by Fourier transforming the field pattern measured in (a). c Measured surface dispersions along high-symmetry lines. d Simulated surface dispersions along high-symmetry lines. e Measured surface isofrequency contours from 10.9 to 11.9 GHz. The color map measures the energy intensity. f Simulated surface isofrequency contours from 10.9 to 11.9 GHz.