期刊
NEW JOURNAL OF PHYSICS
卷 19, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/aa66f8
关键词
acoustic metamaterials; topological insulators; polaritons; quantum spin Hall effect
资金
- Acoustical Society of America through the FrederickVHunt Postdoctoral Research Fellowship in Acoustics
- European Union's Seventh Framework Program under REA grant [PCOFUND-GA-2013-609102]
- PRESTIGE program coordinated by Campus France
Topological insulators, a hallmark of condensed matter physics, have recently reached the classical realm of acoustic waves. A remarkable property of time-reversal invariant topological insulators is the presence of unidirectional spin-polarized propagation along their edges, a property that could lead to a wealth of new opportunities in the ability to guide and manipulate sound. Here, we demonstrate and study the possibility to induce topologically non-trivial acoustic states at the deep subwavelength scale, in a structured two-dimensional metamaterial composed of Helmholtz resonators. Radically different from previous designs based on non-resonant sonic crystals, our proposal enables robust sound manipulation on a surface along predefined, subwavelength pathways of arbitrary shapes.
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