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 …

Recently, we witnessed a tremendous effort to conquer the realm of acoustics as a possible
playground to test with topologically protected sound wave propagation. In this article, we …

The unique properties of light underpin the visions of photonic quantum technologies,
optical interconnects and a wide range of novel sensors, but a key limiting factor today is …

An all-Si photonic structure emulating the quantum-valley-Hall effect is proposed. We show
that it acts as a photonic topological insulator (PTI), and that an interface between two such …

Graphene, a two-dimensional (2D) carbon sheet, acquires many of its amazing properties
from the Dirac point nature of its electronic structures with negligible spin-orbit coupling …

We experimentally demonstrate topological edge states arising from the valley-Hall effect in
two-dimensional honeycomb photonic lattices with broken inversion symmetry. We break the …

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 …

The wave nature of radiation prevents its reflections-free propagation around sharp corners.
We demonstrate that a simple photonic structure based on a periodic array of metallic …

We develop a method to predict the existence of edge states in graphene ribbons for a large
class of boundaries. This approach is based on the bulk-edge correspondence between the …

A non-Hermitian extension of a Chern insulator and its bulk-boundary correspondence are
investigated. It is shown that in addition to the robust chiral edge states that reflect the …