Tunable topological interface states and resonance states of surface waves based on the shape memory alloy  

作　　者：霍绍勇 姚龙超 谢冠宏 符纯明 邱士嘉 龚小超 邓健 Shao-Yong Huo;Long-Chao Yao;Kuan-Hong Hsieh;Chun-Ming Fu;Shih-Chia Chiu;Xiao-Chao Gong;Jian Deng(College of Mechanical Engineering,University of South China,Hengyang 421001,China;1MORE INC,Shenzhen 518000,China)

机构地区：[1]College of Mechanical Engineering,University of South China,Hengyang 421001,China [2]1MORE INC,Shenzhen 518000,China

出　　处：《Chinese Physics B》2023年第3期320-329,共10页中国物理B（英文版）

基　　金：the Doctoral Research Fund of University of South China(Grant No.210XQD016);the Outstanding Youth Foundation of the Hunan Education Department(Grant No.21B0406).

摘　　要：Topological interface state(TIS)of elastic wave has attracted significant research interest due to its potential prospects in strengthening acoustic energy and enhancing the signal accuracy of damage identification and quantification.However,previous implementations on the interface modes of surface waves are limited to the non-adjustable frequency band and unalterable mode width.Here,we demonstrate the tunable TIS and topological resonance state(TRS)of Rayleigh wave by using a shape memory alloy(SMA)stubbed semi-infinite one-dimensional(1D)solid phononic crystals(PnCs),which simultaneously possesses the adjustable mode width.The mechanism of tunability stems from the phase transformation of the SMA between the martensite at low temperature and the austenite at high temperature.The tunable TIS of Rayleigh wave is realized by combining two bandgap-opened PnCs with different Zak phases.The TRS with adjustable mode width is achieved in the heterostructures by adding PnCs with Dirac point to the middle of two bandgap-opened PnCs with different Zak phases,which exhibits the extraordinary robustness in contrast to the ordinary Fabry–Perot resonance state.This research provides new possibilities for the highly adjustable Rayleigh wave manipulation and find promising applications such as tunable energy harvesters,wide-mode filters,and high-sensitivity Rayleigh wave detectors.

关 键 词：tunable topological interface state Rayleigh wave alterable mode width topological phononic crystals shape memory alloys 

分 类 号：O469[理学—凝聚态物理]