• Featured in Physics
  • Editors' Suggestion

Experimental Demonstration of Acoustic Chern Insulators

Yujiang Ding, Yugui Peng, Yifan Zhu, Xudong Fan, Jing Yang, Bin Liang, Xuefeng Zhu, Xiangang Wan, and Jianchun Cheng
Phys. Rev. Lett. 122, 014302 – Published 9 January 2019
Physics logo See Synopsis: One-Way Sound Transport
PDFHTMLExport Citation

Abstract

We report the experimental realization of an acoustic Chern insulator (ACI), by using an angular-momentum-biased resonator array with the broken Lorentz reciprocity. High Q-factor resonance of the constituent rotors is leveraged to reduce the required rotation speed. ACI is a new topological acoustic system analogous to the electronic quantum Hall insulator, based on an effective magnetic field. Experimental results show that the ACI featured with a stable and uniform metafluid flow bias supports one-way nonreciprocal transport of sound at its edges, which is topologically immune to various types of defects. Our work opens up opportunities for exploring unique observable topological phases and developing topological-insulator-based nonreciprocal devices in acoustics.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 23 August 2017

DOI:https://doi.org/10.1103/PhysRevLett.122.014302

© 2019 American Physical Society

Physics Subject Headings (PhySH)

General Physics

Synopsis

Key Image

One-Way Sound Transport

Published 9 January 2019

An array of air channels behaves as an “acoustic Chern insulator” in which sound waves travel only around the edges and only in one direction.

See more in Physics

Authors & Affiliations

Yujiang Ding1,*, Yugui Peng2,*, Yifan Zhu1,*, Xudong Fan1, Jing Yang1, Bin Liang1,†, Xuefeng Zhu2,‡, Xiangang Wan3, and Jianchun Cheng1,§

  • 1Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, People’s Republic of China
  • 2School of Physics and Innovation Institute, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People’s Republic of China
  • 3National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Department of Physics, Nanjing University, Nanjing 210093, People’s Republic of China

  • *These authors contributed equally to this work.
  • To whom correspondence should be addressed. liangbin@nju.edu.cn
  • To whom correspondence should be addressed. xfzhu@hust.edu.cn
  • §To whom correspondence should be addressed. jccheng@nju.edu.cn

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 122, Iss. 1 — 11 January 2019

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×