具有非傍轴声子自旋的滚动波
Rolling Waves with Non-Paraxial Phonon Spins
摘要：
我们证明了一种新的弹性波的散装：当纵向和横向分量以相同的速度传播时，滚动波的自旋是不平行的波矢量可以出现。首先，我们给出了行波自旋的一般定义。然后，由于滚动波不能存在于各向同性固体中，我们推导出各向异性介质的条件，并着手设计能够承载滚动波的建筑材料。数值上，我们显示自旋操纵反射。在这项工作中报告的结构可以使用现有的技术制造，在声学，力学和声子自旋技术开辟了新的可能性。
英文摘要：
We demonstrate a new class of elastic waves in the bulk: When longitudinal and transverse components propagate at the same speed, rolling waves with a spin that is not parallel to the wave vector can emerge. First, we give a general definition of spin for traveling waves. Then, since rolling waves cannot exist in isotropic solids, we derive conditions for anisotropic media and proceed to design architected materials capable of hosting rolling waves. Numerically, we show spin manipulations by reflection. Structures reported in this work can be fabricated using available techniques, opening new possibilities for spin technologies in acoustics, mechanics and phononics.
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