Fig. 8: Experimental measurement.
From: Experimental probe of point gap topology from non-Hermitian Fermi-arcs
a Schematic of the experimental setup. The acoustic bulk and surface states are excited by a headphone. A microphone is fixed on a 3D automatic scanning stage to collect the pressure fields by the network analyzer. b A cuboid sample for measuring the surface state dispersions and Fermi-arc surface states. c The pressure field on the front boundary probed by the microphone. d A right parallelogrammic sample for measuring the abnormal wave propagation and hinge states. e, f The schematics of the experimental setup corresponding to (d).
