Fig. 3: Observation of antichiral surface states in a 3D magnetic Weyl photonic crystal.
From: Topological antichiral surface states in a magnetic Weyl photonic crystal
a, e Schematics of experimental setup for mapping the electric field distributions of the topological surface state on a A-type and e B-type surfaces. The point source (cyan star) is placed at the center of the A-type or B-type surface. b–d Measured iso-frequency contours of the topological surface states on the A-type surface at b 7.85 GHz, c 8.02 GHz, and d 8.22 GHz. The white (green) lines represent the simulated bulk (surface) dispersions. The orange and purple spheres represent the projections of the frequency-shifted WPs with opposite topological charges. f–h Measured iso-frequency contours of the topological surface states on the B-type surface at f 7.85 GHz, g 8.02 GHz, and h 8.22 GHz.
