论文标题
三维耗散冷原子气中的双重链接
Double exceptional links in a three-dimensional dissipative cold atomic gas
论文作者
论文摘要
我们在三维光学晶格中探索了非弱点淋巴结半关系的拓扑特性。我们在三个维度上构建了两个波段连续模型，并具有自旋依赖性增益和损失，其中能量谱中的特殊点可以构成双HOPF链接。散装条带的拓扑特征是在动量空间中定义为一维循环定义的绕组数，并且随着非热性强度的变化，淋巴结结构的拓扑过渡出现。构建了一个非Bloch理论，以描述具有异常散装对应关系的相应晶格模型。此外，我们提出，可以使用光学晶格中的Ultropold费摩原子来实现该模型，并且可以通过测量原子自旋纹理来检测出卓越的淋巴结链接以及拓扑特性。
We explore the topological properties of non-Hermitian nodal-link semimetals with dissipative cold atoms in a three-dimensional optical lattice. We construct a two-band continuum model in three dimensions with a spin-dependent gain and loss, where the exceptional points in the energy spectrum can comprise a double Hopf link. The topology of the bulk band is characterized by a winding number defined for a one-dimensional loop in the momentum space and a topological transition of the nodal structures emerges as the change of the non-Hermiticity strength. A non-Bloch theory is built to describe the corresponding lattice model which has anomalous bulk-boundary correspondence. Furthermore, we propose that the model can be realized using ultracold fermionic atoms in an optical lattice and the exceptional nodal links as well as the topological properties can be detected by measuring the atomic spin textures.
