拓扑(电路)
GSM演进的增强数据速率
物理
声学超材料
声波
表面状态
不变(物理)
凝聚态物理
曲面(拓扑)
声学
几何学
数学
计算机科学
量子力学
电信
组合数学
作者
Tianchong Wu,Xu Jiang,Xin Wu,Qiang Han
摘要
Acoustic transport through topological edge states in phononic crystals improves the suppression of backscattering, which gives these systems significant potential for controlling sound waves. Recent research shows that only one acoustic edge state caused by topological valley phases can transmit in phononic crystals. This paper proposes a genre of valley phases with one, two, and three topological edge states created by transforming the structure of unit cells. The bulk-edge correspondence indicates that these edge states are topological based on the topological invariant number (i.e., the valley Chern number of one, two, and three) of this system coinciding with the number of topological edge states. Different types of defects are introduced into the phononic crystals, whose transmission spectra show that they can withstand bending defects. These results indicate that these systems have significant potential for application in noise control, acoustic communication, and acoustic-electrical integration.
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