Transmission in a quantum wire manipulated by the non-Hermitian skin effect
Phys. Rev. B 114, 045415 – Published 10 July, 2026
DOI: https://doi.org/10.1103/9dvv-x5q3
Abstract
We perform an investigation of the quantum transmission in a quantum wire that is coupled locally to a nonreciprocal quantum chain. Our findings reveal that in this system, the quantum transmission properties are determined by the characteristics of the quantum chain. For the case of the Hermitian chain, it induces abundant antiresonance and bound states in continuum, governed by the length parity of the chain and the wire-chain coupling manner. Next, when nonreciprocal couplings are incorporated in the quantum chain, more Fano antiresonance points are allowed to appear in the transmission function spectra, accompanied by the disappearance of the bound states in continuum. Besides, with the lengthening of the quantum chain, the antiresonance points are transformed into a well-defined insulating band in the transmission function spectra. Further analysis suggests that except the Fano antiresonance, the occurrence of the non-Hermitian skin effect induces additional suppression of the quantum transmission, which leads to the formation of an insulating band. We conclude that this research provides valuable insights for the transmission properties in quantum systems featuring nonreciprocal couplings.
