Wang Dongyi, Deng Yuanchen, Ji Jun, Oudich Mourad, Benalcazar Wladimir A, Ma Guancong, Jing Yun
Department of Physics, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China.
Graduate Program in Acoustics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Phys Rev Lett. 2023 Oct 13;131(15):157201. doi: 10.1103/PhysRevLett.131.157201.
Higher-order topological band theory has transformed the landscape of topological phases in quantum and classical systems. Here, we experimentally demonstrate a two-dimensional higher-order topological phase, referred to as the multiple chiral topological phase, which is protected by a multipole chiral number (MCN). Our realization differs from previous higher-order topological phases in that it possesses a larger-than-unity MCN, which arises when the nearest-neighbor couplings are weaker than long-range couplings. Our phase has an MCN of 4, protecting the existence of 4 midgap topological corner modes at each corner. The multiple topological corner modes demonstrated here could lead to enhanced quantum-inspired devices for sensing and computing. Our study also highlights the rich and untapped potential of long-range coupling manipulation for future research in topological phases.
高阶拓扑能带理论已经改变了量子和经典系统中拓扑相的格局。在此，我们通过实验证明了一种二维高阶拓扑相，即多手性拓扑相，它由多极手性数（MCN）保护。我们的实现与先前的高阶拓扑相不同，因为它具有大于1的MCN，这是当最近邻耦合弱于长程耦合时出现的。我们的相具有4的MCN，保护每个角上存在4个带隙中间拓扑角模式。这里展示的多个拓扑角模式可能会导致用于传感和计算且受量子启发的增强型器件。我们的研究还突出了长程耦合操纵在拓扑相未来研究中丰富且未被挖掘的潜力。
