Abstract
Stable and efficient guided waves are essential for information transmission and processing. Recently, topological valley-contrasting materials in condensed matter systems have been revealed as promising infrastructures for guiding classical waves, for they can provide broadband, non-dispersive and reflection-free electromagnetic/mechanical wave transport with a high degree of freedom. In this work, by designing and manufacturing miniaturized phononic crystals on a semi-infinite substrate, we experimentally realized a valley-locked edge transport for surface acoustic waves (SAWs). Critically, original one-dimensional edge transports could be extended to quasi-two-dimensional ones by doping SAW Dirac “semimetal” layers at the boundaries. We demonstrate that SAWs in the extended topological valley-locked edges are robust against bending and wavelength-scaled defects. Also, this mechanism is configurable and robust depending on the doping, offering various on-chip acoustic manipulation, e.g., SAW routing, focusing, splitting, and converging, all flexible and high-flow. This work may promote future hybrid phononic circuits for acoustic information processing, sensing, and manipulation.
Highlights
Stable and efficient guided waves are essential for information transmission and processing
We have verified that these extended topological valley-locked states (ETVSs) have antireflection ability, high-flow, considerable working bandwidth for surface acoustic waves (SAWs), and are configurable, demonstrating promising prospects for future large-scale phononic integrated circuits with versatile applications
The Quantum Valley Hall Effect (QVHE) was first found in two-dimensional (2D) hexagonal crystals, e.g., graphene[71], double-layer graphene[72], and transition metal dichalcogenides[73]. It originates as a result of the broken space inversion-symmetry. In those quantum states of matters, Diracfermions that correspond to different valleys move to opposite transverse edges in the presence of an in-plane electric field
Summary
Stable and efficient guided waves are essential for information transmission and processing. We have verified that these ETVSs have antireflection ability, high-flow, considerable working bandwidth for SAWs, and are configurable, demonstrating promising prospects for future large-scale phononic integrated circuits with versatile applications.
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