This article reviews recent developments in the non-Hermitian skin effect (NHSE),
particularly on its rich interplay with topology. The review starts off with a pedagogical …

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 …

The study of the laws of nature has traditionally been pursued in the limit of isolated systems,
where energy is conserved. This is not always a valid approximation, however, as the …

Rapidly growing demands for fast information processing have launched a race for creating
compact and highly efficient optical devices that can reliably transmit signals without losses …

A hallmark feature of topological insulators is robust edge transport that is impervious to
scattering at defects and lattice disorder. We demonstrate a topological system, using a …

Higher-order topological insulators are a novel topological phase beyond the framework of
conventional bulk–boundary correspondence,. In these peculiar systems, the topologically …

Topological photonics seeks to control the behaviour of the light through the design of
protected topological modes in photonic structures. While this approach originated from …

Topological insulators constitute a newly characterized state of matter that contains scatter-
free edge states surrounding an insulating bulk. Conventional wisdom regards the insulating …

Nonlinear topological photonics is an emerging field that aims to extend the fascinating
properties of topological states to a regime where interactions between the system …

Non-Hermiticity from nonreciprocal hoppings has been shown recently to demonstrate the
non-Hermitian skin effect (NHSE) under open boundary conditions (OBCs). Here we study …