Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/79940
Title: Unidirectional wave vector manipulation in two-dimensional space with an all passive acoustic parity-time-symmetric metamaterials crystal
Authors: Liu, T 
Zhu, XF
Chen, F 
Liang, SJ 
Zhu, J 
Issue Date: 2018
Publisher: American Physical Society
Source: Physical review letters, 19 Mar. 2018, v. 120, no. 12, 124502 How to cite?
Journal: Physical review letters 
Abstract: Exploring the concept of non-Hermitian Hamiltonians respecting parity-time symmetry with classical wave systems is of great interest as it enables the experimental investigation of parity-time-symmetric systems through the quantum-classical analogue. Here, we demonstrate unidirectional wave vector manipulation in two-dimensional space, with an all passive acoustic parity-time-symmetric metamaterials crystal. The metamaterials crystal is constructed through interleaving groove-and holey-structured acoustic metamaterials to provide an intrinsic parity-time-symmetric potential that is two-dimensionally extended and curved, which allows the flexible manipulation of unpaired wave vectors. At the transition point from the unbroken to broken parity-time symmetry phase, the unidirectional sound focusing effect (along with reflectionless acoustic transparency in the opposite direction) is experimentally realized over the spectrum. This demonstration confirms the capability of passive acoustic systems to carry the experimental studies on general parity-time symmetry physics and further reveals the unique functionalities enabled by the judiciously tailored unidirectional wave vectors in space.
URI: http://hdl.handle.net/10397/79940
ISSN: 0031-9007
EISSN: 1079-7114
DOI: 10.1103/PhysRevLett.120.124502
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