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arXiv · 2510.00921

Non-Hermitian skin effect and electronic nonlocal transport

Carlos Payá·Oliver Solow·Elsa Prada·Ramón Aguado·Karsten Flensberg
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Abstract

Open quantum systems governed by non-Hermitian effective Hamiltonians exhibit unique phenomena, such as the non-Hermitian skin effect, where eigenstates localize at system boundaries. We investigate this effect in a Rashba nanowire coupled to a ferromagnetic lead and demonstrate that it can be detected via nonlocal transport spectroscopy: while local conductance remains symmetric, the nonlocal conductance becomes nonreciprocal. We account for this behavior using both conventional transport arguments and the framework of non-Hermitian physics. Furthermore, we explain that exceptional points shift in parameter space when transitioning from periodic to open boundary conditions, a phenomenon observed in other non-Hermitian systems but so far not explained. Our results establish transport spectroscopy as a tool to probe non-Hermitian effects in open electronic systems.

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Carlos Payá, Oliver Solow, Elsa Prada, Ramón Aguado, Karsten Flensberg. 2025-10-01. Non-Hermitian skin effect and electronic nonlocal transport. https://doi.org/10.1103/9jdy-b418

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