Originally a pure mathematical concept, topology has been vigorously developed in various
physical systems in recent years, and underlies many interesting phenomena such as the …

Weyl medium has triggered remarkable interest owing to its nontrivial topological edge
states in 3D photonic band structures that were mainly revealed as surface modes yet. It is …

In the past few years, the concept of topological matter has inspired considerable research
in broad areas of physics. In particular, photonic artificial microstructures like photonic …

In non-Hermitian systems, defective band degeneracies called exceptional points can form
exceptional lines (ELs) in 3D momentum space in the absence of any symmetries. However …

Optical skyrmions, quasiparticles that are characterized by the topologically nontrivial
vectorial textures of optical parameters such as the electromagnetic field, Stokes …

Topological photonics is a rapidly developing field that leverages geometric and topological
concepts to engineer and control the characteristics of light. Currently, the research on …

In this paper, we demonstrate the existence of multiple photonic Fermi arcs with the same
transmission direction at the interface between two different topological Weyl media. The …

Recently, topologically nontrivial phases in chiral metamaterials have been proposed.
However, a comprehensive description of topological phase diagrams and transitions in …

Lines of exceptional points are robust in the three-dimensional non-Hermitian parameter
space without requiring any symmetry. However, when more elaborate exceptional …

We demonstrate stable Dirac points (DPs) in low dimensions by taking advantage of non-
Hermiticity in an optical lattice composed of two coupled Su–Schrieffer–Heeger chains. The …