In this paper, we provide a comprehensive review of unidirectional reflectionless light
propagation in photonic devices at exceptional points (EPs). EPs, which are branch point …

The induction of synthetic magnetic fields on lattice structures allows an effective control of
their localization and transport properties. In this Letter, we generate effective π magnetic …

Symmetry plays a fundamentally important role in physics. In this work, we find a
conservation law, S†(H c†) S (H c)= I, which is valid for any non-Hermitian scattering center …

We propose an incident direction independent wave propagation generated by properly
assembling different unidirectional destructive interferences (UDIs), which is a consequence …

Symmetry plays fundamental role in physics and the nature of symmetry changes in non-
Hermitian physics. Here the symmetry-protected scattering in non-Hermitian linear systems …

We develop the theory of a special type of scattering state in which a set of asymptotic
channels is chosen as inputs, and the complementary set is chosen as outputs, and there is …

We investigate the two-channel nonreciprocal scattering of a coherent atomic ensemble
under the linear spatial Kramers-Kronig modulation, which has potential applications in …

We propose a quasi-one-dimensional non-Hermitian Creutz ladder with an entirely flat
spectrum by introducing alternating gain and loss components while maintaining inversion …

Hermitian systems possess unitary scattering. However, the Hermiticity is unnecessary for a
unitary scattering although the scattering under the influence of non-Hermiticity is mostly non …

Exceptional points (EPs) are complex singularities of parametric linear operators where two
or more eigenvalues and eigenvectors coalesce. EPs are attracting increasing interest in …