Exceptional points are universal level degeneracies induced by non-Hermiticity. Whereas
past decades witnessed their new physics, the unified understanding has yet to be obtained …

Recently, topological quantum states of non-Hermitian systems, exhibiting rich, new exotic
states, have attracted great attention in condensed-matter physics. As for the demonstration …

We demonstrate the existence of topologically stable unpaired exceptional points (EPs), and
construct simple non-Hermitian (NH) tight-binding models exemplifying such remarkable …

Despite recent extensive studies of the non-Hermitian topology, understanding interaction
effects is left as a crucial question. In this paper, we address interaction effects on …

In this Letter, we study three-dimensional non-Hermitian higher-order Dirac semimetals
(NHHODSMs). Our focus is on C 4-symmetric non-Hermitian systems where we investigate …

We study a new class of non-Hermitian topological phases in three dimensions in the
absence of any symmetry, where the topological robust band degeneracies are Hopf-link …

Non-Hermiticity enriches topological phases beyond the existing Hermitian framework.
Whereas their unusual features with no Hermitian counterparts were extensively explored, a …

We study a topological band degeneracy in non-Hermitian systems with parity-time (PT) and
parity-particle-hole (CP) symmetries. In d-dimensional non-Hermitian systems, it is shown …

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 …

Classifications of symmetry-protected topological (SPT) phases provide a framework to
systematically understand the physical properties and potential applications of topological …