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Isotropic chiral acoustic phonons in 3D quasi-crystalline metamaterials
Physical Review Letters ( IF 9.227 ) Pub Date : 
Yi Chen; Muamer Kadic; Sébastien Guenneau; Martin Wegener

The elastic properties of three-dimensional (3D) crystalline mechanical metamaterials, unlike those of amorphous structures, are generally strongly anisotropic – even in the long-wavelength limit and for highly symmetric crystals. Aiming at isotropic linear elastic wave propagation, we therefore study 3D icosahedral quasi-crystalline mechanical metamaterials consisting of uniaxial chiral meta-rods. Considering increasing order , isotropic effective speeds of sound and isotropic acoustical activity. The latter is directly connected to circularly polarized 3D metamaterial chiral acoustic phonons – for all propagation directions in three dimensions.
更新日期:2020-05-22

 

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