拓扑保护波的完全吸收
Complete absorption of topologically protected waves
摘要：
手征边缘态可以传输能量沿着不完美的界面在拓扑鲁棒性和单向的方式时，由体边界对应的保护。然而，在连续统系统中，界面处的状态数可以取决于边界条件。在这里，我们设计的接口，主机到一个区域的模式数量的净流量，捕获传入的能量。作为实现，我们提出了一个由反向旋转粒子组成的两种拓扑流体的模型系统，它们被从流体-流体界面过渡到无滑动壁的边界分开。在这些流体中，手征边缘状态消失，这意味着非厄米性，并导致拓扑结构和能量耗散之间的新的相互作用。求解流体运动方程，我们找到了消失模式的显式表达式。然后我们得出结论，能量耗散的模式捕获加快。我们的工作不是制造高效的波导，而是展示了如何将拓扑结构用于声学吸收、屏蔽和隔音的应用。
英文摘要：
Chiral edge states can transmit energy along imperfect interfaces in a topologically robust and unidirectional manner when protected by bulk-boundary correspondence. However, in continuum systems, the number of states at an interface can depend on boundary conditions. Here we design interfaces that host a net flux of the number of modes into a region, trapping incoming energy. As a realization, we present a model system of two topological fluids composed of counter-spinning particles, which are separated by a boundary that transitions from a fluid-fluid interface into a no-slip wall. In these fluids, chiral edge states disappear, which implies non-Hermiticity and leads to a novel interplay between topology and energy dissipation. Solving the fluid equations of motion, we find explicit expressions for the disappearing modes. We then conclude that energy dissipation is sped up by mode trapping. Instead of making efficient waveguides, our work shows how topology can be exploited for applications towards acoustic absorption, shielding, and soundproofing.
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