A review is given on the foundations and applications of non-Hermitian classical and
quantum physics. First, key theorems and central concepts in non-Hermitian linear algebra …

This article summarizes some of the relevant features exhibited by binary mixtures of Bose–
Einstein condensates in the presence of coherent coupling at zero temperature. The …

Out of equilibrium, a lack of reciprocity is the rule rather than the exception. Non-reciprocity
occurs, for instance, in active matter,,,,–, non-equilibrium systems,–, networks of neurons …

We report the experimental demonstration of an abnormal, opposite anticrossing effect in a
photon-magnon-coupled system that consists of an yttrium iron garnet film and an inverted …

The Bernard-LeClair (BL) symmetry classes generalize the Altland-Zirnbauer classes in the
absence of Hermiticity. Within the BL scheme, time-reversal and particle-hole symmetry …

The perfect absorption of electromagnetic waves has promoted many applications, including
photovoltaics, radar cloaking, and molecular detection. Unlike conventional methods of …

Level repulsion—the opening of a gap between two degenerate modes due to coupling—is
ubiquitous anywhere from solid-state theory to quantum chemistry. In contrast, if one mode …

In a trapped spin-1/2 Bose-Einstein condensate with miscible interactions, a two-
dimensional spin-orbit coupling can introduce an unconventional spatial separation …

We report strong chiral coupling between magnons and photons in microwave waveguides
that contain chains of small magnets on special lines. Large magnon accumulations at one …

The dissipative light-matter coupling can cause the attraction of two energy levels, ie, level
attraction, when competing with the coherent coupling that induces usual Rabi-level …