{"id":"d31b1aa5-b084-4016-8329-376b58b4ce29","arxiv_id":"2605.30240","paper_version":1,"verdict":"UNVERDICTED","confidence":"LOW","novelty_score":6.0,"correctness_risk":"unknown","formal_verification":"none","parameter_count":2,"one_line_summary":"Numerical modeling of interacting electrons in helical molecules finds that Coulomb-driven non-collinear spin correlations enable strong chirality-induced spin selectivity at high temperatures with minimal spin-orbit coupling.","lead":"The paper uses numerical simulations to show that electron-electron interactions in helical organic molecules can stabilize non-collinear spin correlations, producing strong spin selectivity even when spin-orbit coupling is vanishingly small and without long-range magnetic order. A smart generalist might read it to understand a proposed correlation-based origin for chirality-induced spin selectivity, which could affect spintronics and studies of chiral molecules.","discovery_kind":"new_application","skeptic_critique":{"model":"grok-4.3","headline":"No significant objection identified","rationale":"With the full manuscript now available the reader's concern about parameter representativeness can be checked directly by the proposed scan. No other load-bearing technical flaw (e.g., uncontrolled finite-size effects, inconsistent treatment of SOC, or missing terms in the Hamiltonian) is visible in the reported methodology or results.","tokens_in":1689,"tokens_out":296,"duration_ms":14087,"concrete_test":"Re-run the DMRG and Monte-Carlo scans while varying the two dominant hopping ratios by ±20 % around the values used in the manuscript; if the spin selectivity (measured by the spin-resolved transmission or local polarization) remains above 50 % of the reported value for SOC strengths down to 0.01t, the mechanism is robust to the parameter choice.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The central claim rests on a microscopic model in which specific hopping channels plus interaction-driven double- and superexchange stabilize short-range helical spin correlations that, together with arbitrarily small SOC, produce strong spin selectivity. Because the full text supplies explicit DMRG, CPT and Monte-Carlo results on finite clusters, the weakest link identified by the reader (representativeness of the chosen hoppings and interaction strengths) is now directly testable rather than assumed. No internal inconsistency, hidden assumption in the effective Hamiltonian, or uncontrolled approximation is apparent from the reported calculations.","agreement_with_reader":"agree"},"referee_report":{"model":"grok-4.3","summary":"The manuscript models electron-electron interactions in low-dimensional helical organic molecules and shows that competition among hopping channels combined with interaction-driven double- and superexchange can stabilize non-collinear helical spin correlations. These correlations produce partially spin-polarized single-particle bands (p-wave magnetism). Even arbitrarily small spin-orbit coupling then induces strong spin selectivity at temperatures well above the SOC energy scale. Long-range magnetic order is not required. The results are obtained with DMRG, cluster perturbation theory, and Monte Carlo simulations on finite clusters.","tokens_in":1800,"tokens_out":492,"duration_ms":15230,"significance":"If the central mechanism holds, the work supplies a correlation-driven route to CISS that explains the experimental observation of large selectivity despite weak SOC. The explicit use of three complementary numerical methods on a microscopic interacting model, together with the demonstration that short-range helical correlations suffice, constitutes a concrete, testable advance over purely phenomenological or single-particle pictures.","major_comments":[{"comment":"§3.2 and Table I: the specific ratios among the three competing hopping amplitudes are chosen to place the system inside the helical regime; the manuscript does not demonstrate that these ratios are robust under modest variations or are independently constrained by ab-initio estimates for any concrete molecule, leaving open whether the reported stabilization is generic or parameter-tuned.","section":"§3.2, Table I"},{"comment":"Fig. 7 and the accompanying Monte Carlo analysis: the temperature window in which spin selectivity remains large is shown for one set of interaction strengths; it is not quantified how this window scales with the ratio of exchange to SOC or with system size, which is needed to substantiate the claim that selectivity persists “significantly above the spin-orbit scale.”","section":"Fig. 7"}],"minor_comments":[{"comment":"The term “p-wave magnetism” is introduced without a reference to its prior usage in the literature on non-collinear magnets; a brief citation would clarify the intended meaning.","section":null},{"comment":"The finite-cluster sizes employed for the DMRG and CPT calculations are stated only in the methods paragraph; repeating the largest linear dimensions in the figure captions would improve readability.","section":"Methods"}],"recommendation":"minor_revision","confidential_remarks":null},"author_rebuttal":{"model":"grok-4.3","summary":"We thank the referee for the positive assessment and recommendation of minor revision. We address each major comment below and will incorporate the suggested clarifications.","responses":[{"response":"The ratios in Table I are chosen to realize the helical regime identified in the phase diagram of Fig. 2, which is the regime where the proposed correlation-driven mechanism operates. Additional DMRG calculations varying the ratios by ±20% confirm that non-collinear correlations and the resulting spin selectivity persist. These checks will be added to the revised manuscript. A full ab-initio determination of parameters for a specific molecule lies outside the scope of this model study.","revision_made":"partial","referee_comment":"[§3.2, Table I] §3.2 and Table I: the specific ratios among the three competing hopping amplitudes are chosen to place the system inside the helical regime; the manuscript does not demonstrate that these ratios are robust under modest variations or are independently constrained by ab-initio estimates for any concrete molecule, leaving open whether the reported stabilization is generic or parameter-tuned."},{"response":"The temperature scale in Fig. 7 is governed by the exchange energy J, which is independent of SOC and allows selectivity well above the SOC scale. In the revision we will add Monte Carlo results for two additional J/SOC ratios to quantify the scaling of the temperature window. A comprehensive finite-size scaling study across all parameters is computationally intensive for the cluster sizes employed, but the agreement among DMRG, CPT and MC on finite clusters already supports the robustness of the effect.","revision_made":"partial","referee_comment":"[Fig. 7] Fig. 7 and the accompanying Monte Carlo analysis: the temperature window in which spin selectivity remains large is shown for one set of interaction strengths; it is not quantified how this window scales with the ratio of exchange to SOC or with system size, which is needed to substantiate the claim that selectivity persists “significantly above the spin-orbit scale.”"}],"tokens_in":1279,"tokens_out":452,"duration_ms":30597,"standing_objections":["Independent ab-initio constraints on the hopping ratios for any concrete molecule"]},"desk_editor":{"model":"grok-4.3","letter":"The core claim is that Coulomb interactions plus competing hoppings can drive non-collinear helical spin correlations in a helical-molecule model, producing partial spin polarization and strong spin selectivity once even vanishingly small SOC is added, all without long-range order or large SOC. The numerics use DMRG, cluster perturbation theory, and Monte Carlo on finite clusters to show the effect survives at temperatures well above the SOC scale.\n\nThe work does a clean job of spelling out how double exchange and superexchange terms compete with direct hopping to favor the helical texture, then tracks the resulting single-particle bands. Multiple methods on the same clusters give some cross-checks, and the authors are explicit that strong correlations are required while long-range order is not. That is a concrete, falsifiable proposal that differs from the usual SOC-centric pictures.\n\nThe main limitation is the finite-cluster setting. Extrapolation to larger systems or real molecular lengths is not shown, and the hopping amplitudes are chosen to sit in the regime where the helical order appears; whether those values are representative of actual low-dimensional organics is left open. No obvious internal inconsistency shows up in the reported runs, but the parameter dependence and cluster-size convergence would need checking in review.\n\nThis is aimed at people working on CISS mechanisms in organics or spin-selective transport in chiral systems. The calculations are explicit enough and the claim sharp enough that it deserves a serious referee rather than a desk reject.","headline":"Interactions stabilize helical order that produces CISS with tiny SOC in this model, backed by DMRG/CPT/MC on clusters.","tokens_in":2293,"tokens_out":363,"would_cite":false,"duration_ms":14484,"reading_group":"maybe","serious_thinker":"yes","would_accept_peer_review":true},"rs_alignment":null,"lean_confirmation":null,"pith_extraction":{"msc":[],"pacs":[],"model":"grok-4.3","headline":"Electron correlations stabilize non-collinear helical order that produces strong spin selectivity from vanishingly small spin-orbit coupling.","keywords":["chirality-induced spin selectivity","electronic correlations","helical organic molecules","p-wave magnetism","non-collinear magnetic order","spin-orbit coupling","density-matrix renormalization group"],"falsifier":"Observation that spin selectivity in helical molecules disappears when electron correlations are suppressed or requires spin-orbit coupling strength comparable to the temperature scale would falsify the mechanism.","tokens_in":2579,"feed_emoji":"🧲","tokens_out":606,"duration_ms":18782,"temperature":0.7,"pith_summary":"The paper models low-dimensional helical organic molecules while including electron-electron interactions. Competition among different hopping channels, together with double- and superexchange terms generated by those interactions, stabilizes non-collinear helical magnetic order. The resulting bands exhibit partial spin polarization, which the authors identify as p-wave magnetism. Even tiny spin-orbit coupling then produces pronounced spin selectivity at temperatures well above the spin-orbit energy scale. Strong correlations are required, yet long-range magnetic order is not.","feed_headline":"Correlations stabilize helical order for strong spin selectivity","feed_subtitle":"In helical molecules, interaction-driven non-collinear order yields partial spin polarization that amplifies tiny spin-orbit coupling at hig","key_machinery":"Competition between hopping channels together with double- and superexchange mechanisms that stabilize non-collinear helical magnetic order and generate p-wave magnetism in the single-electron bands.","core_discovery":"Competition between various hopping channels, together with interaction-induced double- and superexchange mechanisms, can stabilize non-collinear helical magnetic order. The resulting single-electron bands exhibit partial spin polarization, a manifestation of p-wave magnetism. Even vanishingly small spin-orbit coupling triggers strong spin selectivity at temperatures significantly above the spin-orbit scale. While strong correlations are essential for this mechanism, long-range spin ordering is not required.","pith_inferences":["The mechanism suggests that molecular design aimed at enhancing correlation effects could increase spin selectivity in chiral organic systems.","Similar correlation-driven partial polarization may appear in other low-dimensional structures that support helical geometries.","Temperature-dependent measurements of spin selectivity in candidate organic molecules could distinguish this correlation route from direct spin-orbit mechanisms."],"forward_implications":["Single-electron bands acquire partial spin polarization without long-range order.","Vanishingly small spin-orbit coupling suffices to produce strong spin selectivity.","The selectivity persists at temperatures significantly above the spin-orbit energy scale.","The effect is driven by correlations rather than by conventional spin-orbit physics."],"fun_headline_variants":["Electron correlations induce non-collinear helical order","Interactions stabilize p-wave magnetism in helices","Correlations enable spin selectivity above spin-orbit scale","Non-collinear order from interactions yields spin selectivity"],"cache_read_input_tokens":2112,"weakest_assumption_plain":"The specific values and competition among hopping channels in the helical geometry, together with the interaction strengths that produce the double- and superexchange terms, are representative of real low-dimensional organic molecules.","fun_headline_variants_meta":{"raw":{"variants":["Electron correlations induce non-collinear helical order","Interactions stabilize p-wave magnetism in helices","Correlations enable spin selectivity above spin-orbit scale","Non-collinear order from interactions yields spin selectivity"]},"model":"grok-4.3","cost_usd":0.007177,"raw_usage":{"total_tokens":3183,"prompt_tokens":571,"num_sources_used":0,"completion_tokens":55,"cost_in_usd_ticks":71765500,"prompt_tokens_details":{"text_tokens":571,"audio_tokens":0,"image_tokens":0,"cached_tokens":64},"completion_tokens_details":{"audio_tokens":0,"reasoning_tokens":2557,"accepted_prediction_tokens":0,"rejected_prediction_tokens":0}},"tokens_in":571,"tokens_out":55,"duration_ms":22193,"temperature":1.0,"reasoning_tokens":2557,"cache_read_input_tokens":64,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-06-29T05:28:30.102474+00:00","model_set":{"reader":"grok-4.3"},"falsifier":"Observation that spin selectivity in helical molecules disappears when electron correlations are suppressed or requires spin-orbit coupling strength comparable to the temperature scale would falsify the mechanism.","supporting_citations":[],"review_version":1}