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Free extension of topological states via double-zero-index media

Rui Dong1,*, Changhui Shen2,*, Zhijun Che1, Changqing Xu1,†, Yun Lai2,‡, and Ce Shang3,§

  • 1Key Laboratory of State Manipulation and Advanced Materials in Provincial Universities, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China
  • 2MOE Key Laboratory of Modern Acoustics, National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, and Jiangsu Physical Science Research Center, Nanjing University, Nanjing 210093, China
  • 3Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

  • *These authors contributed equally to this work.
  • †Contact author: changqing.xu@nnu.edu.cn
  • ‡Contact author: laiyun@nju.edu.cn
  • §Contact author: shangce@aircas.ac.cn

Realization of rainbow large-area acoustic topological corner states

Xueyun Wen, Yafeng Chen, Zhihao Lan, Zhongming Gu, and Jie Zhu

Phys. Rev. Applied 26 014013 (2026)

Acoustic waveguides without sound-hard claddings enabled by boundary-selective double-zero-index medium

Lingzhe Kong and Changqing Xu

APS Open Sci. 1 000066 (2026)

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