Non‐Hermitian Hartman Effect

Abstract The Hartman effect refers to the rather paradoxical result that time spent by a quantum mechanical particle or photon tunnel through an opaque potential barrier becomes independent of width for long barriers. Such effect, which has been observed in different physical settings, raised lively debate and some controversies, owing correct definition interpretation tunneling times apparent superluminal transmission. A open question is whether (and under conditions) persists inelastic scattering, is, when non‐Hermitian scattering matrix not unitary. Here, heterojunction tight‐binding picture considered, where consists generally finite‐sized lattice attached two semi‐infinite nearest‐neighbor Hermitian leads. simple general condition derived persistence barriers, showing it can be found non‐Hermiticity arises from nonreciprocal couplings, displays skin without any special symmetry system.