Diffusion driven by temperature or concentration gradients is a fundamental mechanism of
energy and mass transport that inherently differs from wave propagation in both physical …

There are two prominent applications of the mathematical concept of topology to the physics
of materials: band topology, which classifies different topological insulators and semimetals …

Nontrivial topological surface states (TSSs), which possess extraordinary carrier mobility
and are protected by the bulk symmetry, have emerged as an innovative platform to search …

Controlling topological phases of light allows the observation of abundant topological
phenomena and the development of robust photonic devices. The prospect of more …

The concept of topological energy bands and their manifestations have been demonstrated
in condensed matter systems as a fantastic paradigm toward unprecedented physical …

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) …

Nonreciprocal transmission, resulting from the breaking of Lorentz reciprocity, plays a pivotal
role in nonreciprocal communication systems by enabling asymmetric forward and …

Axions, hypothetical elementary particles that remain undetectable in nature, can arise as
quasiparticles in three-dimensional crystals known as axion insulators. Previous …

Photonic Chern insulators are known for their topological chiral edge states (CESs), whose
absolute existence is determined by the bulk band topology, but concrete dispersion can be …

Topological insulators are crystalline materials that have revolutionized our ability to control
wave transport. They provide us with unidirectional channels that are immune to obstacles …