Recent research in topological photonics has not only proposed and realized novel
topological phenomena such as one‐way broadband propagation and robust transport of …

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 …

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 …

Weyl and Dirac semimetals are three-dimensional phases of matter with gapless electronic
excitations that are protected by topology and symmetry. As three-dimensional analogs of …

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 …

Weyl points are isolated degeneracies in reciprocal space that are monopoles of the Berry
curvature. This topological charge makes them inherently robust to Hermitian perturbations …

Topological semimetals are materials whose band structure contains touching points that
are topologically nontrivial and can host quasiparticle excitations that behave as Dirac or …

Topological photonics is a rapidly emerging field of research in which geometrical and
topological ideas are exploited to design and control the behavior of light. Drawing …

Weyl fermions are hypothetical two-component massless relativistic particles in three-
dimensional (3D) space, proposed by Hermann Weyl in 1929. Their band-crossing points …

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 …