Polariton lasers emit coherent monochromatic light through a spontaneous emission
process. As a rare example of a system in which Bose–Einstein condensation and …

Non-Hermitian photonics and topological photonics, as new research fields in optics, have
attracted much attention in recent years, accompanying by a great deal of new physical …

We study the Hatano-Nelson model, ie, a one-dimensional non-Hermitian chain of spinless
fermions with nearest-neighbor nonreciprocal hop**, in the presence of repulsive nearest …

Topological insulators are a concept that originally stems from condensed matter physics. As
a corollary to their hallmark protected edge transport, the conventional understanding of …

Non-Hermitian systems exhibit nontrivial band topology and a strong sensitivity of the
energy spectrum on the boundary conditions. Remarkably, a macroscopic number of bulk …

Non-Hermitian Hamiltonians provide an alternative perspective on the dynamics of quantum
and classical systems coupled non-conservatively to an environment. Once primarily an …

Non-Hermitian degeneracies, also known as exceptional points (EPs), have been the focus
of much attention due to their singular eigenvalue surface structure. Nevertheless, as …

The quest for realizing novel fundamental physical effects and practical applications in
ambient conditions has led to tremendous interest in microcavity exciton polaritons working …

The synergy between non-Hermitian concepts and topological ideas have led to very fruitful
activity in the recent years. Their interplay has resulted in a wide variety of new non …

Topological physics relies on Hamiltonian's eigenstate singularities carrying topological
charges, such as Dirac points, and–in non-Hermitian systems–exceptional points (EPs) …