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 …

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 …

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 …

Non-Hermiticity significantly enriches the properties of topological models, leading to exotic
features such as the non-Hermitian skin effects and non-Bloch bulk-boundary …

Manipulating topological invariants is possible by modifying the global properties of optical
devices to alter their band structures. This could be achieved by statically altering devices or …

A unique feature of non-Hermitian (NH) systems is the NH skin effect, ie, the edge
localization of an extensive number of bulk-band eigenstates in a lattice with open or semi …

The non-Hermitian skin effect (NHSE) in non-Hermitian lattice systems, associated with a
point gap on the complex energy plane, has attracted great theoretical and experimental …

Matter transport is a fundamental process in nature. Understanding and manipulating flow in
a synthetic media often have rich implications for modern device design. Here we …

It is generally assumed that a Hamiltonian for a physically acceptable quantum system (one
that has a positive-definite spectrum and obeys the requirement of unitarity) must be …

Single-mode operation is a desirable but elusive property for lasers operating at high pump
powers. Typically, single-mode lasing is attainable close to threshold, but increasing the …