Topological Nodal States in Circuit Lattice
Topological Nodal States in Circuit Lattice
复制标题
电路晶格中的拓扑节点态
DOI：
10.1155/2018/6793752
复制
发表时间：
2018-01-01
期刊：
影响因子：
11
通讯作者：
Weng, Hongming
中科院分区：
文献类型：
--
作者：
Luo, Kaifa;Yu, Rui;Weng, Hongming
寻找具有可调拓扑性质的人工结构是当今拓扑物理学的一个有趣的研究方向。本文介绍了一种利用三维周期电感-电容（LC）电路晶格来实现拓扑节点状态的方案，通过调整电感和电容的参数来实现拓扑节点线态和Weyl态。为了分析LC电路晶格的拓扑性质，推导了一个类似紧密结合的模型。在这些系统中发现了拓扑态的关键特征，如节点线态的鼓状表面带和Weyl态的费米弧状表面带。我们还证明了Weyl点随电子器件的制造误差是稳定的。
The search for artificial structure with tunable topological properties is an interesting research direction of today's topological physics. Here, we introduce a scheme to realize topological nodal states with a three-dimensional periodic inductor-capacitor (LC) circuit lattice, where the topological nodal line state and Weyl state can be achieved by tuning the parameters of inductors and capacitors. A tight-binding-like model is derived to analyze the topological properties of the LC circuit lattice. The key characters of the topological states, such as the drumhead-like surface bands for nodal line state and the Fermi arc-like surface bands for Weyl state, are found in these systems. We also show that the Weyl points are stable with the fabrication errors of electric devices.