论文标题
手性三斜晶晶体支撑各向同性声学和各向同性手性声子
Chiral Triclinic Metamaterial Crystals Supporting Isotropic Acoustical Activity and Isotropic Chiral Phonons
论文作者
论文摘要
最近的工作预测，在3D手性icosaheDral跨质质准晶体的三立方体晶体近似值中，最低带的各向同性语音声子分散关系的存在。尽管这些体系结构是相当宽带的，并且可能由于取消定向而定于制造公差，但它们非常复杂，非常难以在实验上制造，并且与普通高度各向异性性手性的立方体材料晶体相比，它们的效果大约要小的数量级。在这里，我们提出和分析一种表现出宽带各向同性声学活性的手性三斜纹层层晶体。这些3D桁架晶格的复杂性要小得多，并且比3D准晶体的效果要大得多，而价格更容易受到制造公差的影响。这种敏感性源于我们为最低的两个横向声音带定制的事实，以在动量空间中表现出“偶然”的变性。
Recent work predicted the existence of isotropic chiral phonon dispersion relations of the lowest bands connected to isotropic acoustical activity in cubic crystalline approximants of 3D chiral icosahedral metamaterial quasicrystals. While these architectures are fairly broadband and presumably robust against fabrication tolerances due to orientation averaging, they are extremely complex, very hard to manufacture experimentally, and they show effects which are about an order of magnitude smaller compared to those of ordinary highly anisotropic chiral cubic metamaterial crystals. Here, we propose and analyze a chiral triclinic metamaterial crystal exhibiting broadband isotropic acoustical activity. These 3D truss lattices are much less complex and exhibit substantially larger effects than the 3D quasicrystals at the price of being somewhat more susceptible to fabrication tolerances. This susceptibility originates from the fact that we have tailored the lowest two transverse phonon bands to exhibit an "accidental" degeneracy in momentum space.
