a Sketch of the unstrained (grey) and strained (black) honeycomb lattice geometry, forming a zigzag terminated triangle of size L = 14. The green arrows indicate the directions ρl, l = 1, 2, 3, of the effective triaxial strain. Inset: the underlying lattice is composed of two sublattices A (red) and B (blue). The local coupling strengths are denoted tl and depend on the location of the bonds in the lattice [see Eq. (1) and the text for details]. b Illustration of the experimental setup. The lattice is composed of 196 identically designed cylindrical dielectric resonators that are coupled through the evanescent field of the fundamental TE mode. The structure is placed inside a microwave cavity made of two metallic plates (top plate only partially shown). A loop antenna mounted on a scanning system (white arrows) crossing the top plate and connected to a vector network analyzer (VNA) is used to generate and collect the spectrally and spatially resolved microwave signal, which allows us to obtain the local density of states in the system
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