Abstract
Topological interface states have attracted extensive research interest due to their unprecedented field confinement and enhancement at the interface between two one-dimensional phononic crystals with distinct topological characteristics. However, the realization of the contactless, nondestructive, and intelligent tunability of topological interface states, as the foundation for designing novel devices with unconventional functionalities, still remains a great challenge. Here, we introduce intelligent magnetoelastic materials to the topological system and realize magnetically tunable topological interface states for Lamb waves in one-dimensional phononic crystal slabs composed of alternating nonmagnetic and magnetoelastic layers. The properties of magnetoelastic layers can be tuned with noncontact, nondestruction, and intelligence by an external magnetic field. By changing the value of the external magnetic field applied on intercell and intracell magnetoelastic layers, the spatial variation of the properties of magnetoelastic layers is induced, resulting in an in situ topological phase transition. We demonstrate that topological interface states appear at the interface between two topologically different magnetoelastic phononic crystal slabs. Furthermore, based on the tunability of the external magnetic field, the existence of topological interface states can be switched and the frequency of topological interface states can be continuously tuned. In particular, the arbitrary positions of topological interface states can be dynamically achieved by varying the external magnetic field without altering the structure. Our tunable topological system can enable intelligent Lamb-wave devices with remarkable functionalities, which can lead to significant advances in intelligently controlled Lamb-wave switches, magnetically tunable frequency selectors, and magnetic control Lamb-wave communications.
Highlights
Topological physics has been studied extensively from the quantum Hall effect[1] to topological insulators,[2] where topologically protected edge states appear at boundaries in quantum systems and are immune to backscattering
Substantial advances of the tunability based on the external magnetic field have been achieved, magnetically tunable topological interface states remain unfulfilled in 1D phononic systems
We introduce intelligent magnetoelastic materials to the topological system and realize magnetically tunable topological interface states for Lamb waves in 1D phononic crystal slabs that are constructed by stacking alternating nonmagnetic and magnetoelastic layers
Summary
Topological physics has been studied extensively from the quantum Hall effect[1] to topological insulators,[2] where topologically protected edge states appear at boundaries in quantum systems and are immune to backscattering. Xiao et al.[29] studied the geometric phase and topological transition in the 1D periodic acoustic structure They have demonstrated that topological interface states form at the interface. Zhao et al.[37] systematically and numerically investigated topological interface states in the subwavelength region in 1D local resonant acoustic structure Their topological interface states are fixed after machining, which restricts functionality enhancement and practical applications. We introduce intelligent magnetoelastic materials to the topological system and realize magnetically tunable topological interface states for Lamb waves in 1D phononic crystal slabs that are constructed by stacking alternating nonmagnetic and magnetoelastic layers. Based on the tunability of the external magnetic field, we further demonstrate that the existence of topological interface states can be switched and the frequency of topological interface states can be continuously adjusted.
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