- Accepted Paper
Multiple Andreev reflection spectroscopy of spin-resolved proximity states
Phys. Rev. B - Accepted 2 November, 2026
DOI: https://doi.org/10.1103/pspn-zpf3
Phys. Rev. B - Accepted 2 November, 2026
DOI: https://doi.org/10.1103/pspn-zpf3
We study coherent multiple Andreev reflections (MAR) in short constrictions connecting superconductor–ferromagnet bilayers with parallel exchange fields. Proximity-induced spectral reconstruction produces split and redistributed differential-resistance anomalies, modifying both odd- and even-order subharmonic features, unlike a rigid Zeeman shift of BCS spectra. The shifted anomalies are approximately governed by the interval between the parent superconducting gap edge and an exchange-dependent spectral singularity. Spectral-interval estimates are also presented for antiparallel alignment. Channel-transparency averaging extends the description from short ballistic constrictions to short diffusive multichannel junctions, where the characteristic anomalies survive. These findings provide a route to probing spin-resolved proximity states through two-terminal charge transport.
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