Two Exceptional-Point Regimes in the Spinterface Model of Chirality-Induced Spin Selectivity

Seif Alwan

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arXiv · 2610.37072

Two Exceptional-Point Regimes in the Spinterface Model of Chirality-Induced Spin Selectivity

Seif Alwan

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Abstract

The spinterface model of chirality-induced spin selectivity supports two algebraically distinct near-exceptional-point (EP) regimes, which cannot be mixed. A \emph{gold-level} near-EP involves the two gold spin states under an anti-Hermitian, electrode-mediated spin flip with spin-symmetric dissipative broadening (Scheme~B). A \emph{chain-level} near-EP involves the collective coalescence of the two molecular eigenstates with largest weight on the first molecular site under a Hermitian on-site Rashba spin flip with spin-dependent broadening (Scheme~A). Mixing the diagonal cancellation of one scheme with the off-diagonal structure of the other yields a strictly negative discriminant and admits no EP on any parameter path, making the gold/chain classification exhaustive. At the gold near-EP the spin-flip coupling is chirality-selective, converting achiral spin-valve transport into purely chiral transport across well-defined crossover points. At the chain near-EP the Petermann factor grows as a power law in chain length, with an exponent tunable by the Rashba coherence length and non-monotonic in the Rashba strength, reflecting a balance between coherent enhancement and progressive breakdown of the Scheme-A condition. Both near-EPs are dressed versions of the ideal two-state EP, and the ratio between observed and bare EP locations measures the delocalisation of the coalescing pair, providing a fit-free diagnostic of the mechanism. These results identify CISS junctions as a solid-state platform for non-Hermitian spectral physics.

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Seif Alwan. 2026-10-27. Two Exceptional-Point Regimes in the Spinterface Model of Chirality-Induced Spin Selectivity. https://arxiv.org/abs/2610.37072

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