Symmetries play a paramount role in many aspects of topological physics. A particularly
illuminating example is the Su-Schrieffer-Heeger (SSH) chain, whose reflection and chiral …

One of the unique features of non-Hermitian (NH) systems is the appearance of NH
degeneracies known as exceptional points (EPs). The extensively studied defective EPs …

A thorough understanding of the topological classifications of non-Hermitian energy bands
is essential for advancing non-Hermitian band theory and its applications. As evidenced in …

Symmetry and non-Hermiticity play pivotal roles in photonic lattices. While symmetries, such
as parity-time (⁠ PT⁠) symmetry, have attracted ample attention, more intricate crystalline …

The mathematical theory of braids, influential across scientific disciplines, has emerged as a
compelling strategy for light manipulation. Existing approaches to creating braids in …

Non-Hermitian systems and their topological singularities, such as exceptional points (EPs),
lines, and surfaces, have recently attracted intense interest. The investigation of these …