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This paper presents experimental evidence of the existence of acoustic valleyHall (AVHE) edge states in topological elastic waveguides. The fundamentallattice is assembled based on a non-resonant unit where space inversionsymmetry (SIS) is broken by simply perturbing the underlying lattice geometry.This aspect is in net contrast with existing elastic AVHE designs that exploitlocally-resonant units and require the addition of masses in order to breakSIS. The experimental results presented in this study validate findings so farpresented only at theoretical and numerical level. In particular, it is foundthat edge modes can effectively propagate along domain walls betweentopologically dissimilar domains and that disorder-induced backscattering issubstantially suppressed due to the weak coupling between oppositelyvalley-polarized modes. The coupling between valley modes is also furtherinvestigated and linked to an evident chiral flux of the mechanical energy.Finally, we show that the weak coupling between the valleys can be exploited toachieve selective mode injection at the domain wall, hence realizing a veryeffective excitation strategy of the chiral edge states.

Experimental evidence of robust acoustic valley Hall edge states in a non-resonant topological elastic waveguide