The topological properties of an object, associated with an integer called the topological
invariant, are global features that cannot change continuously but only through abrupt …

Over the past decade, topology has emerged as a major branch in broad areas of physics,
from atomic lattices to condensed matter. In particular, topology has received significant …

Topological photonics has attracted increasing attention in recent years due to the unique
opportunities it provides to manipulate light in a robust way immune to disorder and defects …

Abstract The terahertz (0.1–10 THz) range represents a fast-evolving research and industrial
field. The great interest for this portion of the electromagnetic spectrum, which lies between …

Chiral edge states that propagate oppositely at two parallel strip edges are a hallmark
feature of Chern insulators which were first proposed in the celebrated two-dimensional (2D) …

Terahertz science and technology promise many cutting-edge applications. Terahertz
surface plasmonic waves that propagate at metal–dielectric interfaces deliver a potentially …

Weyl semimetals (WSMs) exhibit phenomena such as Fermi arc surface states, pseudo-
gauge fields and quantum anomalies that arise from topological band degeneracy in …

Topological photonics is a new and rapidly growing field that deals with topological phases
and topological insulators for light. Recently, the scope of these systems was expanded …

Higher-order Weyl semimetals are a family of recently predicted topological phases
simultaneously showcasing unconventional properties derived from Weyl points, such as …

Negative refraction, an unnatural optical phenomenon in which the incident and the
refracted waves reside on the same side of the surface normal, has been demonstrated with …