# Helical resonant transport and purified amplification at an exceptional point

@article{Zhang2019HelicalRT, title={Helical resonant transport and purified amplification at an exceptional point}, author={K. L. Zhang and L. Jin and Z. Song}, journal={Physical Review B}, year={2019} }

We propose an application of a parity-time symmetric non-Hermitian Su-Schrieffer-Heeger (SSH) model by embedded it in a two-dimensional square lattice tube. The coalescence state at the exceptional point of non-Hermitian SSH model is chiral and selectively controls helical transport and amplification. Two typical helicity-dependent scattering dynamics are observed. If the incidence has an identical helicity with the embedded non-Hermitian SSH model, we observe a perfect transmission without…

## 6 Citations

Coherent confinement and unidirectional dynamics of a wave packet induced by a non-Hermitian Su-Schrieffer-Heeger segment

- PhysicsPhysical Review A
- 2020

The competition between staggered imaginary potentials and lattice dimerization result in a unidirectional propagating coalescing state of a non-Hermitian Su-Schrieffer-Heeger (SSH) ring at…

Chiral Current Circulation and PT Symmetry in a Trimer of Oscillators

- PhysicsACS Photonics
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We present a simple quantum theory of a bosonic trimer in a triangular configuration, subject to gain and loss in an open quantum systems approach. Importantly, the coupling constants between each…

Chiral current circulation and $\mathcal{PT}$ symmetry in a trimer of oscillators.

- Physics
- 2020

We present a simple quantum theory of a bosonic trimer in a triangular configuration, subject to gain and loss in an open quantum systems approach. Importantly, the coupling constants between each…

Non-Hermitian topological states in 2D line-graph lattices: evolving triple exceptional points on reciprocal line graphs

- PhysicsNew Journal of Physics
- 2021

Non-Hermitian (NH) topological states, such as the doubly-degenerate nodes dubbed as exceptional points (EPs) in Bloch band structure of 2D lattices driven by gain and loss, have attracted much…

Resonant generation of a
p
-wave Cooper pair in a non-Hermitian Kitaev chain at the exceptional point

- Physics
- 2020

We investigate a non-Hermitian extension of a Kitaev chain by considering imaginary $p$-wave pairing amplitudes. The exact solution shows that the phase diagram consists of two phases with real and…

Self-Shielded Topological Receiver Protectors

- PhysicsPhysical Review Applied
- 2020

Receiver protectors (RPs) shield sensitive electronics from high-power incoming signals that might damage them. Typical RP schemes range from simple fusing and PIN diodes to superconducting circuits…

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