Non-Hermitian optics is a burgeoning field at the intersection of quantum physics,
electrodynamics, and nanophotonics. It provides a new perspective of the role of gain and …

Nearly one century after the birth of quantum mechanics, parity–time symmetry is
revolutionizing and extending quantum theories to include a unique family of non-Hermitian …

The bulk-boundary correspondence is crucial to topological insulators. It associates the
existence of boundary states (with zero energy and possessing chiral or helical properties) …

In the past decade, the concept of parity-time $(\mathcal {PT}) $ symmetry, originally
introduced in non-Hermitian extensions of quantum mechanical theories, has come into …

We introduce here the concept of acoustic parity-time (PT) symmetry and demonstrate the
extraordinary scattering characteristics of the acoustic PT medium. On the basis of exact …

By investigating information flow between a general parity-time (PT-) symmetric non-
Hermitian system and an environment, we find that the complete information retrieval from …

We prove that balanced loss-gain distributions provide an elegant path towards realizing
loss-free unidirectional cloaks for objects much larger than the wavelength. By coating a …

We investigate in the framework of quantum noise theory how the striking boundary
sensitivity recently discovered in the context of non-Hermitian (NH) topological phases may …

PT-symmetric theory is developed to extend quantum mechanics to a complex region, but it
wins its great success first in classical systems, for example, optical waveguides and electric …

We introduce here a parity-time-(PT) symmetric system using an optically pumped, active
graphene metasurface paired with a resistive metallic filament, realizing a unidirectional …