One-way propagation of topologically non-conventional bulk transverse elastic waves in infinite and finite superlattices: Application to low-loss acoustic wave devices

Static superlattices that do not break time-reversal symmetry can support robust topologically protected elastic waves with non-zero amplitude in the forward propagating direction but zero opposite direction. We form a prototypical acoustic wave device by sandwiching finite superlattice supports one-way between input and detector layers. Compared to conventional waves, provide significant benefit for reducing return loss of device. Superlattices supporting attractive disruptive solutions designing next-generation low-loss devices telecommunication or sensing.