Helical resonant transport and purified amplification at an exceptional point

  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},
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… 

Figures from this paper

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


Asymmetric transmission through a flux-controlled non-Hermitian scattering center
We study the possibility of asymmetric transmission induced by a non-Hermitian scattering center embedded in a one-dimensional waveguide, motivated by the aim of realizing quantum diode in a
Topological photonic states in one-dimensional dimerized ultracold atomic chains
We study the topological optical states in one-dimensional (1D) dimerized ultracold atomic chains, as an extension of the Su-Schrieffer-Heeger (SSH) model. By taking the fully retarded near-field and
Non-Hermitian transparency and one-way transport in low-dimensional lattices by an imaginary gauge field
Unidirectional and robust transport is generally observed at the edge of two- or three-dimensional quantum Hall and topological insulator systems. A hallmark of these systems is topological
Photonic zero mode in a non-Hermitian photonic lattice
A robust photonic zero mode sustained by a spatial non-Hermitian phase transition in a parity-time (PT) symmetric lattice, despite the same topological order across the entire system, is demonstrated.
The emergence, coalescence and topological properties of multiple exceptional points and their experimental realization
Non-Hermitian systems distinguish themselves from Hermitian systems by exhibiting a phase transition point called an exceptional point (EP), which is the point at which two eigenstates coalesce under
Parity–time symmetry and exceptional points in photonics
The role of PT symmetry and non-Hermitian dynamics for synthesizing and controlling the flow of light in optical structures is highlighted and a roadmap for future studies and potential applications is provided.
Topologically protected bound states in photonic parity-time-symmetric crystals.
This work shows theoretically and experimentally the existence of states that are localized at the interface between two topologically distinct PT-symmetric photonic lattices, and finds analytical closed form solutions of topological PT-Symmetric interface states.
Robust light transport in non-Hermitian photonic lattices
This work suggests a different route toward robust transport of light in lower-dimensional (1D) photonic lattices, in which time reversal symmetry is broken because of the non-Hermitian nature of transport.
Non-Hermitian interferometer: Unidirectional amplification without distortion
A non-Hermitian interferometer can realize asymmetric transmission in the presence of imaginary potential and magnetic flux. Here, we propose a non-Hermitian dimer with an unequal hopping rate by an