论文标题
跨不均质的双层声学分离材料的动态拓扑泵送的实验证明
Experimental Demonstration of Dynamic Topological Pumping Across Incommensurate Bilayered Acoustic Metamaterials
论文作者
论文摘要
无泵可以被视为整数量子厅效应的动态版本。在有限尺寸的配置中，这种拓扑泵显示了边缘模式，这些模式从一个散装波段动态出现并潜入相反的散装波段，这种效果可以通过量子和经典系统复制。在这里，我们通过泵送这种拓扑边缘模式报告了跨超材料的第一个未辅助动态能量转移。该系统是一种拓扑周期性的声学晶体，具有可以在绝热循环中快速且定期驱动的Phason。当超材料的一个边缘在拓扑范围的频率范围内激发时，放置在另一个边缘的麦克风一旦泵送过程就开始拾取信号。相比之下，当禁止的频率范围是非主张时，麦克风不会选择信号。
A Thouless pump can be regarded as a dynamical version of the integer quantum Hall effect. In a finite-size configuration, such topological pump displays edge modes that emerge dynamically from one bulk-band and dive into the opposite bulk-band, an effect that can be reproduced with both quantum and classical systems. Here, we report the first un-assisted dynamic energy transfer across a metamaterial, via pumping of such topological edge modes. The system is a topological aperiodic acoustic crystal, with a phason that can be fast and periodically driven in adiabatic cycles. When one edge of the metamaterial is excited in a topological forbidden range of frequencies, a microphone placed at the other edge starts to pick up a signal as soon as the pumping process is set in motion. In contrast, the microphone picks no signal when the forbidden range of frequencies is non-topological.
