论文标题
远程相互作用引起的III型角状态的观察
Observation of type-III corner states induced by long-range interactions
论文作者
论文摘要
远程相互作用（LRI）本质上是普遍存在的。高阶拓扑（热）绝缘子代表物质的新阶段。一个关键的问题是LRI如何决定热阶段。在这项工作中，我们发现了四个拓扑不同的阶段，即热相，连续体中的结合状态，Dirac半学相（DSM）相和带有可调LRI的呼吸kagome电路中的琐碎绝缘体相。我们在热阶段发现了一个新兴的III拐角状态，该状态从边缘状态连续分裂，源自不同边缘节点之间的强耦合。我们通过阻抗和电压测量来实验检测这种新型状态。在DSM阶段，Dirac锥体表现出巡回特征，其可调位置取决于LRI强度。我们的发现提供了对LRI对外来拓扑状态的影响的更深入的了解，并为调节托面电路的相互作用铺平了道路。
Long-range interactions (LRIs) are ubiquitous in nature. Higher-order topological (HOT) insulator represents a new phase of matter. A critical issue is how LRI dictates the HOT phases. In this work, we discover four topologically distinct phases, i.e., HOT phase, the bound state in the continuum, Dirac semimetal (DSM) phase, and trivial insulator phase in a breathing kagome circuit with tunable LRIs. We find an emerging type-III corner state in the HOT phase, which splits from the edge state continuum and originates from the strong couplings between nodes at different edges. We experimentally detect this novel state by impedance and voltage measurements. In the DSM phase, the Dirac cone exhibits an itinerant feature with a tunable position that depends on the LRI strength. Our findings provide a deeper understanding of the LRI effect on exotic topological states and pave the way for regulating interactions in topolectrical circuits.
