期刊
PHYSICAL REVIEW APPLIED
卷 13, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.13.021001
关键词
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资金
- US National Science Foundation [1847254]
- Vibration Institute
- New York State Center of Material Informatics
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1847254] Funding Source: National Science Foundation
Space-time-varying materials pledge to deliver nonreciprocal dispersion in linear systems by inducing an artificial momentum bias. Although such a paradigm eliminates the need for actual motion of the medium, experimental realization of space-time structures with dynamically changing material properties has been elusive. In this letter, we present an elastic metamaterial that exploits stiffness variations in an array of geometrically phase-shifted resonators-rather than external material stimulation-to induce a temporal modulation. We experimentally demonstrate that the resulting bias breaks time-reversal symmetry in the resonant metamaterial, and achieves a nonreciprocal tilt of dispersion modes within dynamic modulation regimes.
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