论文标题
使用单光子干涉法模拟异常的非热金属
Simulating Exceptional Non-Hermitian Metals with Single-Photon Interferometry
论文作者
论文摘要
我们在光子设置非热（NH）金属中进行实验模拟，其特征在于其淋巴结结构的拓扑特性。在相互空间中实施单身时间的演变，然后进行干涉测量，我们探测了相应的NH Bloch Hamiltonians的复杂征素性，并详细研究了其异常线（ELS），Hermitian Systems中NODAL线的NH对应物的NH对应物。我们专注于两种不同类型的NH金属：具有对称性保护EL的二维系统，以及具有结与对称性独立的拓扑ELS的三维系统。尽管两种类型都具有开放的费米表面，但我们通过分析破坏对称性扰动对ELS拓扑的影响通过实验观察它们的区别。
We experimentally simulate in a photonic setting non-Hermitian (NH) metals characterized by the topological properties of their nodal band structures. Implementing nonunitary time evolution in reciprocal space followed by interferometric measurements, we probe the complex eigenenergies of the corresponding NH Bloch Hamiltonians, and study in detail the topology of their exceptional lines (ELs), the NH counterpart of nodal lines in Hermitian systems. We focus on two distinct types of NH metals: two-dimensional systems with symmetry-protected ELs, and three-dimensional systems possessing symmetry-independent topological ELs in the form of knots. While both types feature open Fermi surfaces, we experimentally observe their distinctions by analyzing the impact of symmetry-breaking perturbations on the topology of ELs.
