Quasiperiodic Bloch-Like States in a Surface-Wave Experiment

Bloch-like surface waves associated with a quasiperiodic structure are observed for the first time in a classic wave propagation experiment which consists of pulse propagation with a shallow fluid covering a quasiperiodically drilled bottom. We show that a transversal pulse propagates as a plane wave with quasiperiodic modulation, displaying the characteristic undulatory propagation in this quasiperiodic systems and reinforcing the idea that analogous concepts to Bloch functions can be applied to quasicrystals under certain circumstances.