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Observation of acoustic valley vortex states and valley-chirality locked beam splitting

Liping Ye, Chunyin Qiu, Jiuyang Lu, Xinhua Wen, Yuanyuan Shen, Manzhu Ke, Fan Zhang, and Zhengyou Liu
Phys. Rev. B 95, 174106 – Published 23 May 2017

Abstract

We report an experimental observation of the classical version of valley polarized states in a two-dimensional hexagonal sonic crystal. The acoustic valley states, which carry specific linear momenta and orbital angular momenta, were selectively excited by external Gaussian beams and conveniently confirmed by the pressure distribution outside the crystal, according to the criterion of momentum conservation. The vortex nature of such intriguing bulk crystal states was directly characterized by scanning the phase profile inside the crystal. In addition, we observed a peculiar beam-splitting phenomenon, in which the separated beams are constructed by different valleys and locked to the opposite vortex chirality. The exceptional sound transport, encoded with valley-chirality locked information, may serve as the basis of designing conceptually interesting acoustic devices with unconventional functions.

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  • Received 31 December 2016
  • Revised 13 April 2017

DOI:https://doi.org/10.1103/PhysRevB.95.174106

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Liping Ye1, Chunyin Qiu1,*, Jiuyang Lu4, Xinhua Wen1, Yuanyuan Shen1, Manzhu Ke1, Fan Zhang3, and Zhengyou Liu1,2

  • 1Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, China
  • 2Institute for Advanced Studies, Wuhan University, Wuhan 430072, China
  • 3Department of Physics, University of Texas at Dallas, Richardson, Texas 75080, USA
  • 4Department of Physics, South China University of Technology, Guangzhou 510641, China

  • *Corresponding author: cyqiu@whu.edu.cn

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Issue

Vol. 95, Iss. 17 — 1 May 2017

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