We present a design to achieve antichiral edge states in acoustic systems where edge states on the two parallel edges of a lattice with a strip geometry propagate in the same direction. This peculiar phenomenon is realized by using a honeycomb lattice consisting of acoustic resonators with staggered air flow; i.e., the air flow takes opposite directions in resonators belonging to different sublattices. The existence of antichiral edge states is revealed through full-wave simulations of the band structure and acoustic fields excited by a point source. Furthermore, we compare these antichiral edge states with conventional chiral edge states. It is found that the antichiral edge states are less robust than the chiral ones. Our work offers new possibilities for dispersion engineering and wave manipulations in acoustics.

中文翻译：

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具有交错气流的声谐振器晶格中的反手性边缘状态

我们提出了一种在声学系统中实现反手性边缘状态的设计，其中边缘状态在具有条形几何形状的晶格的两个平行边缘上沿相同方向传播。这种奇特的现象是通过使用由具有交错气流的声谐振器组成的蜂窝格子实现的；即，空气流在属于不同子晶格的谐振器中采用相反的方向。通过对点源激发的带结构和声场进行全波模拟，揭示了反手性边缘态的存在。此外，我们将这些反手性边缘状态与传统的手性边缘状态进行了比较。发现反手性边缘状态不如手性边缘状态稳健。我们的工作为声学中的色散工程和波处理提供了新的可能性。