In recent years, notions drawn from non-Hermitian physics and parity–time (PT) symmetry
have attracted considerable attention. In particular, the realization that the interplay between …

In the past few years, concepts from non-Hermitian (NH) physics, originally developed within
the context of quantum field theories, have been successfully deployed over a wide range of …

Nonradiating sources of energy have traditionally been studied in quantum mechanics and
astrophysics but have received very little attention in the photonics community. This situation …

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 …

The fermion doubling theorem plays a pivotal role in Hermitian topological materials. It
states, for example, that Weyl points must come in pairs in three-dimensional semimetals …

We study non-Hermitian photonic lattices that exhibit competition between conservative and
non-Hermitian (gain/loss) couplings. A bipartite sublattice symmetry enforces the existence …

The invention of the laser has revolutionized modern science and engineering as well as
our daily lives. Recently, a new class of lasers based on concepts borrowed from parity–time …

We investigate the exceptional points (EPs) in a non-Hermitian system composed of a pair of
graphene sheets with different losses. There are two surface plasmon polaritons (SPPs) …

Exceptional points (EPs) in non-Hermitian systems have recently attracted considerable
attention owing to unique state-flipping and peculiar phase accumulation features. The …

Optical gyroscopes measure the angular velocity using the Sagnac effect. However, the
resonance splitting due to the Sagnac effect is directly proportional to the linear dimensions …