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

Light and sound are the most ubiquitous forms of waves, associated with a variety of
phenomena and physical effects such as rainbows and echoes. Light and sound, both …

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 …

Quantum cascade lasers are compact, electrically pumped light sources in the
technologically important mid-infrared and terahertz region of the electromagnetic spectrum …

Most natural and artificial materials have crystalline structures from which abundant
topological phases emerge,,,,–. However, the bulk–edge correspondence—which has been …

The realization of integrated, low-cost and efficient solutions for high-speed, on-chip
communication requires terahertz-frequency waveguides and has great potential for …

Symmetry breaking in 2D layered materials plays a significant role in their macroscopic
electrical, optical, magnetic and topological properties, including, but not limited to, spin …

Photonic topological insulators provide a route for disorder-immune light transport, which
holds promise for practical applications. Flexible reconfiguration of topological light …

Recently, higher-order topological phases that do not obey the usual bulk-edge
correspondence principle have been introduced in electronic insulators and brought into …

Originating from the studies of two-dimensional condensed-matter states, the concept of
topological order has recently been expanded to other fields of physics and engineering …