Research about singularities has been driving scientific advancements across mathematics
and physics. Comprehending and harnessing the novel properties of singularities in …

Recently, the real topology has been attracting widespread interest in two dimensions (2D).
Here, based on first‐principles calculations and theoretical analysis, we reveal the …

There has been a significant focus on real topological systems that enjoy space‐time
inversion symmetry and lack spin‐orbit coupling. While the theoretical classification of the …

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 …

The unique structural sensitivity of photonic crystals (PCs) endows them with stretchable or
elastic tunability for light propagation and spontaneous emission modulation. Hydrogel PCs …

We numerically and experimentally demonstrated a higher-order topological state in a three-
dimensional (3D) photonic crystal (PhC) with a complete photonic band gap. Two types of …

The emergent higher-order topological insulators significantly deepen our understanding of
topological physics. Recently, the study has been extended to topological semimetals …

Herein, we present the investigation of the visible light transparency and optical limiting
characteristics of one dimensional photonic crystals with LiNbO3 defects fabricated by the …

Topological states in crystalline materials have aroused significant research attention in
recent years and have been expanded into intrinsic magnetic materials and high-order …

Space-time inversion symmetry can generate intriguing types of spinless excitations in
crystalline materials. Here, we propose a topological phase protected by space-time …