Recently, topological chains have attracted extensive attention because of their simple
structure, rich physics and important applications. In this work, we theoretically and …

Topological states in non-Hermitian systems are known to exhibit some anomalous features.
Here, we find two new anomalous features of non-Hermitian topological states. We consider …

A three-dimensional non-Hermitian Hamiltonian with parity-time symmetry can exhibit a
closed exceptional surface (EP surface) in momentum space, which is a non-Hermitian …

A cyclic four‐mode optical system is investigated with anti‐parity‐time symmetry. The energy
spectra is analyzed and reveal the topological phase transition under different parameter …

A three-dimensional non-Hermitian Hamiltonian with parity-time symmetry can exhibit a
closed exceptional surface (EP surface) in momentum space, which is a non-Hermitian …

We propose an implementation of a generalized Su-Schrieffer-Heeger (SSH) model based
on optomechanical arrays. The topological properties of the generalized SSH model depend …

We study the topological features in a trimerized lattice of parity-time symmetry with
comparable nearest-neighbor (NN) and next-nearest-neighbor (NNN) couplings as well as a …

We theoretically investigate the band structure of the one-dimensional rhombus lattice by
considering the existence of P T-symmetric imaginary potentials. Results show that the …

Quantum transport in a class of nonlinear extensions of the Rudner-Levitov model is
numerically studied in this paper. We show that the quantization of the mean displacement …

We study classification of anti-Hermitian topological insulators based on the discrete
symmetries: time-reversal, particle-hole and chiral symmetries. Contrary to the most general …