Valley Physics in Non-Hermitian Artificial Acoustic Boron Nitride

Mudi Wang, Liping Ye, J. Christensen, and Zhengyou Liu
Phys. Rev. Lett. 120, 246601 – Published 12 June 2018
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Abstract

The valley can serve as a new degree of freedom in the manipulation of particles or waves in condensed matter physics, whereas systems containing combinations of gain and loss elements constitute rich building units that can mimic non-Hermitian properties. By introducing gain and loss in artificial acoustic boron nitride, we show that the acoustic valley states and the valley-projected edge states display exotic behaviors in that they sustain either attenuated or amplified wave propagation. Our findings show how non-Hermiticity introduces a mechanism in tuning topological protected valley transports, which may have significance in advanced wave control for sensing and communication applications.

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  • Received 19 October 2017

DOI:https://doi.org/10.1103/PhysRevLett.120.246601

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsFluid Dynamics

Authors & Affiliations

Mudi Wang1, Liping Ye1, J. Christensen2,*, and Zhengyou Liu1,3,†

  • 1Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, China
  • 2Department of Physics, Universidad Carlos III de Madrid, Avenida de la Universidad 30, 28916 Leganes (Madrid), Spain
  • 3Institute for Advanced Studies, Wuhan University, Wuhan 430072, China

  • *Corresponding author. jchriste@inst.uc3m.es
  • Corresponding author. zyliu@whu.edu.cn

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Issue

Vol. 120, Iss. 24 — 15 June 2018

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