Extended Data Fig. 4: Measurements of the disclination states without the PRBs.
From: Bulk–disclination correspondence in topological crystalline insulators
a, Illustration of the experimental system. A PhC disclination made of Al2O3 pillars (pink) is cladded by parallel metal plates (grey) above and below, and is surrounded by microwave absorption sponges (blue). Inset: top view of the sample. The white dashed line denotes the mirror symmetry plane of the disclination. b, Eigenstates spectrum (top) and the simulated (middle) and measured (bottom) transmission between source A and detector B for the PhC with d = a/2 (no central pillar). Grey regions denote the bulk band regions. c, d, Electric-field profiles of disclination states from eigenstate calculations (c) and measurements (d). The positive and negative signs indicate whether the sources C and D (green stars) have the same sign or opposite signs. e, f, The corresponding phase distributions of the electric-field from calculations (e) and measurements (f).
