DING Yujiang1, PENG Yugui2, ZHU Yifan1,LIANG Bin1, ZHU Xuefeng2, CHENG Jianchun1*
(1 Key Laboratory of Modern Acoustics of Ministry of Education,Institute of Acoustics, Nanjing University, Nanjing 210093, Jiangsu, China;2 School of Physics, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China)
Abstract:
Acoustic Chern insulator (ACI) is a new topological acoustic system analogous to the electronic quantum Hall insulator, based on an effective magnetic field.The experimental realization of an ACI, by using an angular-momentum-biased resonator array with the broken Lorentz reciprocity is reported.High Q-factor resonance of the constituent rotors is leveraged to reduce the required rotation speed. Experimental results show that the ACI featured with a stable and uniform flow bias supports one-way nonreciprocal transport of sound at its edges, which is topologically immune to various types of defects.The work opens up opportunities for exploring unique observable topological phases and developing topological-insulator-based nonreciprocal devices in acoustics.
KeyWords:
acoustic Chern insulator; ring resonator; flow bias; edge state
