论文标题
非线性Weyl半法中差距结束点的拓扑特征
Topological characteristics of gap closing points in nonlinear Weyl semimetals
论文作者
论文摘要
在这项工作中，我们探讨了非线性对三维拓扑阶段的影响。特别令人感兴趣的是所谓的Weyl半法，以其Weyl节点而闻名，即始终成对存在的点状拓扑电荷，并表现出对一般扰动的显着鲁棒性。发现现场非线性的存在会导致这些Weyl节点中的每一个分解成两个不同能量的淋巴结和淋巴结表面，同时保留其拓扑电荷。根据所考虑的系统，其他淋巴结线可能会在高非线性强度下进一步出现。我们提出了两种不同的方法来探测观察到的淋巴结结构。首先，使用绝热抽水过程允许检测原始Weyl节点引起的淋巴结和表面。其次，AHARONOV-BOHM干扰实验尤其富有成果，可以捕获在高非线性下出现的其他淋巴结线。
In this work we explore the effects of nonlinearity on three-dimensional topological phases. Of particular interest are the so-called Weyl semimetals, known for their Weyl nodes, i.e., point-like topological charges which always exist in pairs and demonstrate remarkable robustness against general perturbations. It is found that the presence of onsite nonlinearity causes each of these Weyl nodes to break down into nodal lines and nodal surfaces at two different energies while preserving its topological charge. Depending on the system considered, additional nodal lines may further emerge at high nonlinearity strength. We propose two different ways to probe the observed nodal structures. First, the use of an adiabatic pumping process allows the detection of the nodal lines and surfaces arising from the original Weyl nodes. Second, an Aharonov-Bohm interference experiment is particularly fruitful to capture additional nodal lines that emerge at high nonlinearity.
