A d-dimensional second-order topological insulator (SOTI) can host topologically protected
(d-2)-dimensional gapless boundary modes. Here, we show that a 2D non-Hermitian SOTI …

Second-order topological insulator (SOTI) is featured with the presence of (d− 2)-
dimensional boundary states in d-dimension systems. The non-Hermiticity induced …

A non-Hermitian topological insulator with a real spectrum is interesting in the theory of non-
Hermitian extension of topological systems. We find an experimentally realizable example of …

The non-Hermitian skin effect (NHSE) in non-Hermitian lattice systems, associated with a
point gap on the complex energy plane, has attracted great theoretical and experimental …

There have been considerable efforts devoted to the study of topological phases in certain
non-Hermitian systems that possess real eigenfrequencies in the presence of gain and loss …

Topological phases of matter are classified based on their Hermitian Hamiltonians, whose
real-valued dispersions together with orthogonal eigenstates form nontrivial topology. In the …

Beyond the scope of Hermitian physics, non-Hermiticity fundamentally changes the
topological band theory, leading to interesting phenomena, eg, non-Hermitian skin effect, as …

We introduce the exceptional topological insulator (ETI), a non-Hermitian topological state of
matter that features exotic non-Hermitian surface states which can only exist within the three …

A prominent feature of some one-dimensional non-Hermitian systems is that all right
eigenstates of the non-Hermitian Hamiltonian are localized in one end of the chain. The …

Higher-order topological phases of matter have been extensively studied in various areas of
physics. While the Aubry-André-Harper model provides a paradigmatic example to study …