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arxiv: 2501.00781 · v1 · submitted 2025-01-01 · ❄️ cond-mat.mes-hall · cond-mat.soft· physics.chem-ph

Chiral induced Spin Polarized Electron Current: Origin of the Chiral Induced Spin Selectivity Effect

J. Fransson This is my paper

Pith reviewed 2026-05-23 06:04 UTC · model grok-4.3

classification ❄️ cond-mat.mes-hall cond-mat.softphysics.chem-ph
keywords chiral induced spin selectivitychiralitydissipationspin polarizationspin degeneracymolecular structureselectron current
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The pith

Chirality breaks spin degeneracy while dissipation enables non-vanishing spin polarization, and both are required for the chiral induced spin selectivity effect.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper establishes that the chiral induced spin selectivity effect arises only when two conditions are met simultaneously in molecules without heavy elements. Chirality is required to break the degeneracy between spin states, and dissipation must be present for the molecule to sustain a net spin polarization in the electron current. Theoretical analysis of molecular models demonstrates that omitting either condition prevents the effect. A reader would care because this pins the origin of observed spin selectivity to the interplay of structure and energy loss rather than to other mechanisms.

Core claim

Two aspects have to be fulfilled for the chiral induced spin selectivity effect to arise. First, chirality is a necessary condition for breaking spin-degeneracy in molecular structures that do not comprise heavy elements. Second, dissipation is indispensable for the molecule to develop a non-vanishing spin-polarization. These conclusions are illustrated through examples that show the necessity of coordinating both aspects.

What carries the argument

Theoretical demonstration that chirality breaks spin degeneracy and dissipation allows net spin polarization in electron transport through molecular structures.

If this is right

  • The effect is absent in achiral molecules without heavy elements.
  • Models must include dissipation to produce non-zero spin polarization.
  • Both chirality and dissipation must act together for spin selectivity to emerge.
  • Examples confirm that removing either condition eliminates the effect.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Experiments could vary dissipation rates in chiral molecules to test whether spin polarization scales accordingly.
  • The result suggests focusing device design on controlling energy loss channels in chiral molecular junctions.
  • It connects the effect to other transport phenomena where symmetry breaking and irreversibility are both needed.

Load-bearing premise

The selected molecular examples fully represent the general requirements for the effect without other mechanisms producing spin polarization independently.

What would settle it

Detection of substantial spin-polarized current in an achiral molecule lacking heavy elements or in a chiral molecule with no dissipation channels would falsify the necessity of both conditions.

Figures

Figures reproduced from arXiv: 2501.00781 by J. Fransson.

Figure 1
Figure 1. Figure 1: FIG. 1. Calculated equilibrium spin-resolved charge distributions for [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Calculated equilibrium spin-distributions projected in (a) [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. Calculated equilibrium spin-distributions projected in (a) [PITH_FULL_IMAGE:figures/full_fig_p005_4.png] view at source ↗
read the original abstract

The discovery of the chiral induced spin selectivity effect has provided a novel tool to study how active physical and chemical mechanism may differ in chiral enantiomers, however, the origin of the effect itself is yet an open question. In this article, it is theoretically shown that two aspects have to be fulfilled for the chiral induced spin selectivity effect to arise. First, chirality is a necessary condition for breaking spin-degeneracy in molecular structures that do not comprise heavy elements. Second, dissipation is indispensable for the molecule to develop a non-vanishing spin-polarization. These theoretical conclusions are illustrated in terms of a few examples, showing the necessity of the two aspects to be coordinated for the emergence of the chiral induced spin selectivity effect.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 1 minor

Summary. The manuscript claims that two conditions must be fulfilled for the chiral induced spin selectivity (CISS) effect: chirality is necessary to break spin degeneracy in molecular structures without heavy elements, and dissipation is required for the molecule to develop non-vanishing spin polarization. These conclusions are illustrated through a few examples rather than a general derivation.

Significance. Clarifying the minimal requirements for CISS would be useful for the field, as it could explain why the effect appears only in certain chiral systems and guide both theory and experiment. The paper's emphasis on the joint necessity of structural chirality and open-system dynamics is a clear framing, though its generality remains to be established.

major comments (1)
  1. [theoretical analysis and examples section] The central claim that chirality is a necessary condition for breaking spin degeneracy (absent heavy elements) and that dissipation is indispensable for nonzero polarization is supported only by illustrative examples in the chosen models. No model-independent proof is provided that these conditions hold for arbitrary chiral molecules or that counterexamples are impossible when additional terms (e.g., weak spin-orbit coupling from light atoms or coherent transport channels) are included. This directly affects the load-bearing assertion in the abstract and theoretical conclusions.
minor comments (1)
  1. The abstract states that conclusions are 'illustrated in terms of a few examples' but does not name the specific Hamiltonians or parameter regimes used; the full text should explicitly define these models for reproducibility.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their constructive comments on our manuscript. The major concern regarding the lack of a model-independent proof is addressed below, and we propose revisions to better delineate the scope of our claims.

read point-by-point responses

  1. Referee: [theoretical analysis and examples section] The central claim that chirality is a necessary condition for breaking spin degeneracy (absent heavy elements) and that dissipation is indispensable for nonzero polarization is supported only by illustrative examples in the chosen models. No model-independent proof is provided that these conditions hold for arbitrary chiral molecules or that counterexamples are impossible when additional terms (e.g., weak spin-orbit coupling from light atoms or coherent transport channels) are included. This directly affects the load-bearing assertion in the abstract and theoretical conclusions.

    Authors: We agree that the manuscript demonstrates the necessity of chirality and dissipation through specific illustrative models rather than a general, model-independent derivation, as explicitly noted in the abstract. A comprehensive proof applicable to every conceivable chiral Hamiltonian lies outside the present scope. In the models examined, chirality is required to lift spin degeneracy when heavy-element spin-orbit coupling is absent, while dissipation enables a nonzero steady-state polarization. We will revise the abstract, introduction, and conclusions to state more precisely that the conclusions apply to the class of models considered and to discuss why weak spin-orbit terms from light atoms remain negligible and why purely coherent dynamics cannot sustain net polarization. These changes will temper the load-bearing assertions without altering the core physical insight. revision: yes

Circularity Check

0 steps flagged

No circularity; claims illustrated via models without reduction to inputs by construction

full rationale

The paper states that chirality and dissipation are necessary, illustrated through a few examples rather than a general derivation. No load-bearing step reduces a claimed result to a fitted parameter, self-citation chain, or self-definitional equivalence (e.g., no equation where a 'prediction' equals its own input by construction). The approach is a standard model-based demonstration; external benchmarks or independent verification are not required for the circularity check, and none of the enumerated patterns apply based on the provided text.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract-only review supplies no information on free parameters, background axioms, or new postulated entities.

pith-pipeline@v0.9.0 · 5654 in / 1024 out tokens · 50712 ms · 2026-05-23T06:04:28.147245+00:00 · methodology

discussion (0)

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Reference graph

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