Non-Hermitian skin effect (NHSE) has led to interesting physics and sophisticated
applications beyond the conventional framework. However, NHSE studies have been limited …

Exceptional point and spectral singularity are two types of singularity that are unique to non-
Hermitian systems. Here, we report the high-order spectral singularity as a high-order pole …

Causality—the principle stating that the output of a system cannot temporally precede the
input—is a universal property of nature. Here, we show that analogous input-output relations …

The reflectionless coherent light transport in the coupled resonator array is investigated in
the presence of intra-resonator intermodal coupling between the clockwise and …

Unraveling real eigenfrequencies in non-Hermitian PT-symmetric Hamiltonians has opened
avenues in quantum physics, photonics, and most recently, phononics. However, the …

Non-reciprocal reflections of optical signals are unusual yet fascinating to achieve the
imminent applications of non-reciprocal photonic devices and circuits. The complete non …

Spatio-temporal permittivity modulation can simultaneously impart wave vector and
frequency shifts during an indirect photonic transition process where nonreciprocal …

In non-Hermitian systems, the singularities refer to poles or zeros of the scattering and
transfer matrices. Here, we investigate the kinds of singularities in a non-parity-time …

Fano resonance line shape performs ultrasensitive sensing characteristics as its ultrahigh
quality factor. Here, we theoretically investigate the sensitivity and figure of merit (FOM) of a …

A judicious design of gain and loss leads to counterintuitive wave phenomena that are
inaccessible by conservative systems. Notably, such designs can give rise to laser-absorber …