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… 
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