Dynamically Control the Elastic Wave Bandgap in Wrinkled Two-Dimensional Materials
Guangfei Zhu, Rumeng Liu, Lifeng Wang
Abstract: Controlling elastic wave transmission at the micro-nanoscale is crucial for developing on-chip dynamic sensing systems, such as surface acoustic wave devices. Strain-sensitive and durable two-dimensional (2D) materials have emerged as key candidates for next-generation flexible electronic devices due to their exceptional physical properties. This study systematically investigates the elastic wave transmission characteristics of shear-induced wrinkles in MoS2. It is found that the periodic stress field induced by wrinkling causes the discretization of nature modes of vibration and creates a Bragg bandgap, which effectively suppresses subwavelength elastic waves propagation. Notably, in bilayer MoS2 structure, anisotropic interlayer sliding causes symmetry breaking in the wrinkles, folding the original bandgap and generating new bandgaps at the fold positions. Furthermore, the bandgaps can be effectively tuned by applying shear or tensile/compressive strain. These findings offer new perspectives for controlling high-frequency elastic waves. By leveraging the flexible strain tunability and outstanding physical properties of 2D materials, they provide valuable insights for designing multifunctional integrated devices.
文章链接：https://www.sciencedirect.com/science/article/pii/S0022460X26001355
