Nonreciprocal charge and spin transport induced by non-Hermitian skin effect in mesoscopic heterojunctions

The pursuit of the non-Hermitian skin effect (NHSE) in various physical systems is great research interest. Compared with recent progress non-electronic systems, implementation NHSE condensed matter physics remains elusive. Here, we show that can be engineered mesoscopic heterojunctions (system plus reservoir) which electrons two channels system moving towards each other have asymmetric coupling to those reservoir. This makes forward and opposite direction unequal lifetimes, so gives rise a point-gap spectral topology. Accordingly, electron eigenstates exhibit under open boundary condition, consistent description generalized Brillouin zone. Such reservoir-engineered visibly manifests itself as nonreciprocal charge current probed by standard transport measurements. Further, generalize scenario spin-resolved NHSE, spin transport. Our work opens new avenue for implementing detecting electronic will lead interesting device applications.