{"id":"49494ad0-19c1-406a-a481-e00bb7743bbc","arxiv_id":"2508.08372","paper_version":1,"verdict":"UNVERDICTED","confidence":"LOW","novelty_score":6.0,"correctness_risk":"medium","formal_verification":"none","parameter_count":2,"one_line_summary":"A minimal model of a kagome antiferromagnet with proximity-induced superconductivity shows a valley-singlet phase at experimental parameters and topological phases with Chern numbers ±1 and ±3.","lead":"Using a minimal model, this paper predicts how superconductivity appears when a superconductor is placed in contact with a kagome antiferromagnet like Mn3Ge. It finds a valley-singlet superconducting phase matching experiments, plus topological superconducting phases that could be useful for spintronics.","discovery_kind":"new_application","skeptic_critique":{"model":"deepseek-v4-flash","headline":"The claimed consistency of the valley-singlet superconducting phase with Mn3Ge is asserted in the abstract but cannot be checked from the provided material; without the model parameters and derivations, the central claim remains unverified.","rationale":"The reader's weakest assumption was that the minimal model faithfully represents the low-energy physics of Mn3Ge. My read agrees: the load-bearing premise is the model-to-experiment correspondence, and the available text (only the abstract) provides no evidence for it. The abstract asserts that the valley-singlet phase appears for 'chemical potentials and canting consistent with the experimental system,' but no numerical parameter values, derivation, or numerical verification are supplied. Because the full text is absent from the review packet, I cannot check the internal consistency of the model or the Chern-number calculations. This does not mean the paper is wrong; it means the central claim is currently unverified. The appropriate disposition remains UNVERDICTED, which is unchanged from the reader's verdict. No ad hominem or dismissal is intended; the concern is strictly about the availability and concreteness of the technical support for the model-to-experiment claim.","tokens_in":712,"tokens_out":5630,"duration_ms":60573,"concrete_test":"Obtain the full manuscript and extract the exact parameter values (chemical potential, canting angle, pairing amplitude, spin-orbit coupling, hopping integrals) used for the 'consistent with the experimental system' region of the phase diagram. Compare the model's Fermi surface and magnetic canting with published ARPES and neutron-scattering data for Mn3Ge; then independently recompute the BdG Chern numbers. If the valley-singlet phase appears only for parameters outside the experimentally measured ranges, or if the Chern numbers change when next-nearest-neighbor hopping or a Rashba term is added, the central claim does not land.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The paper's central claim is that a minimal model of a chiral kagome antiferromagnet with proximity-induced pairing yields a valley-singlet superconducting phase for chemical potentials and spin canting matching the Mn3Ge experiments. The load-bearing assumption is that the model's Fermi surface, spin canting, pairing symmetry, and spin-orbit coupling are indeed representative of the Mn3Ge/SC heterostructure. In the provided material, however, the full text is missing: there is no Hamiltonian, no parameter list, no BdG calculation, and no comparison with experimental data. The statement 'consistent with the experimental system' is therefore an unsupported assertion. If the parameter window used in the model does not correspond to the actual Mn3Ge Fermi energy and magnetic structure, the predicted valley-singlet phase would not be realized in the experimental system, and the Chern numbers C_BdG = ±1, ±3 would be a property of the toy model rather than a prediction for the material. This is a verification gap rather than a demonstrated error; the paper cannot be adjudicated from the abstract alone.","agreement_with_reader":"agree"},"referee_report":{"model":"deepseek-v4-flash","summary":"The submission consists solely of an abstract claiming that a minimal model of a chiral kagome antiferromagnet with proximity-induced superconductivity exhibits a valley-singlet superconducting phase for chemical potentials and spin canting 'consistent with' the experimental Mn3Ge system, a Chern insulator at larger canting, and topological superconducting phases with Chern numbers C_BdG = ±1, ±3. No Hamiltonian, parameter list, derivations, numerical methods, or experimental comparisons are provided; the full text of the manuscript is absent from the submission.","tokens_in":910,"tokens_out":3916,"duration_ms":41528,"significance":"If the claimed phase diagram is established with parameters tied to Mn3Ge, the prediction of spin-polarized Cooper pairs and topological superconductivity in a kagome antiferromagnet would be of considerable interest for spintronics and for the broader field of proximitized magnetic materials. However, the abstract alone offers no verifiable technical content: there are no equations, no symmetry analysis, no definition of the Chern numbers, and no evidence that the model parameters correspond to Mn3Ge. The significance therefore cannot currently be assessed beyond the plausibility of the claim.","major_comments":[{"comment":"The submission contains only the abstract; there is no Hamiltonian, no definition of the model parameters (e.g., the chemical potential μ and canting angle θ), no Bogoliubov–de Gennes formalism, no method for computing the Chern numbers, and no comparison to the Mn3Ge experimental data. As a result, the central claim that the valley-singlet phase appears for 'chemical potentials and canting consistent with the experimental system' is unverifiable. This is not a matter of style but of the fundamental basis of the paper: every substantive assertion in the abstract is unsupported by the provided material. The authors must supply the full manuscript before any technical evaluation is possible.","section":"Abstract (full text missing)"},{"comment":"The phrase 'consistent with the experimental system' is ambiguous and potentially circular. If μ and θ are chosen so that the model reproduces the observed superconducting state, then the valley-singlet phase is an input rather than a prediction; if they are derived from independent measurements, the paper must state the values and their provenance. Without this information, the abstract's central claim cannot be distinguished from fitting to the target phenomenon. Please specify the parameter window and the experimental constraints used.","section":"Abstract"}],"minor_comments":[{"comment":"The abstract does not cite the experimental papers on Mn3Ge that provide 'strong evidence' for proximity-induced superconductivity; these citations are needed to ground the claim and to allow readers to trace the experimental constraints.","section":"Abstract"},{"comment":"The symbols μ, θ, and C_BdG are used without definition; even in an abstract, a brief description of these quantities (for example, 'C_BdG is the Chern number of the Bogoliubov–de Gennes Hamiltonian') would improve clarity.","section":"Abstract"},{"comment":"The term 'valley-singlet' is introduced without explanation; if it refers to a specific pairing symmetry or band-degree-of-freedom structure, that should be stated explicitly, as the term is not universally familiar.","section":"Abstract"}],"recommendation":"major_revision","confidential_remarks":"The submission as provided is not a reviewable manuscript—it consists of an abstract with no accompanying full text. The editor may wish to return it to the authors as an incomplete submission or ask for a complete version before sending it out for review. The scientific claim may be interesting, but it cannot be evaluated without the derivations, parameter choices, and data comparison."},"author_rebuttal":null,"desk_editor":{"model":"deepseek-v4-flash","letter":"The abstract reports a minimal-model phase diagram for proximity-induced superconductivity in chiral kagome antiferromagnets. The concrete contribution is mapping out phases as a function of chemical potential and spin canting: a valley-singlet superconducting phase in the window claimed to match Mn3Ge, a Chern insulator at larger canting, and topological superconducting phases with Chern numbers +/-1 and +/-3 elsewhere. If the model is faithful, this gives experimentalists a target: which doping and canting regimes to probe for spin-polarized or topological Cooper pairs. That is a real, useful theory result, not just a suggestion.\n\nThe paper also deserves credit for framing the problem around recent Mn3Ge experiments rather than working in the abstract. The claimed connection to a specific material is what makes the phase diagram interesting, and the topological phases away from the fitted region are genuine predictions.\n\nThe soft spot is exactly that claim of consistency. We only have the abstract, and there is no way to check whether the parameter window for the valley-singlet phase comes from independent inputs (band structure, exchange couplings, proximity gap) or from scanning parameters until a phase compatible with experiment appears. If it is the latter, the valley-singlet phase is an input, not a prediction. The wording 'consistent with the experimental system' is doing a lot of work. This is a verification gap, not a demonstrated flaw.\n\nFor the same reason, the math and the numerics cannot be adjudicated at all. There is no Hamiltonian, no BdG equation, no parameter list, no comparison with experimental spectra. The Chern numbers are stated but not derived. That is fine for an abstract, but it limits how much confidence anyone can have.\n\nMy take: this deserves a serious referee. A good referee should ask how the model parameters are fixed, whether the pairing symmetry and spin-orbit coupling are realistic for a Mn3Ge/superconductor interface, and whether the topological phases survive beyond the minimal model. I would not cite it in my own work until I see the full model. But I would bring it to a reading group if anyone wants a concrete example of theory-experiment overlap in unconventional superconductivity. Send it to peer review rather than desk reject; the question is whether the full paper delivers on the abstract's promises. The abstract alone is not enough to verify, but it is enough to warrant a look.","headline":"Plausible and potentially useful phase diagram; the main uncertainty is whether the model parameters are derived from Mn3Ge or fitted to reproduce the desired phase.","tokens_in":744,"tokens_out":1068,"would_cite":false,"duration_ms":26342,"reading_group":"maybe","serious_thinker":"unclear","would_accept_peer_review":true},"rs_alignment":null,"lean_confirmation":null,"pith_extraction":{"msc":[],"pacs":[],"model":"deepseek-v4-flash","headline":"A minimal model of the chiral kagome antiferromagnet Mn3Ge with proximity-induced superconductivity predicts a valley-singlet superconducting phase at the experimentally relevant parameters and topological superconducting phases with…","keywords":["chiral kagome antiferromagnet","Mn3Ge","proximity superconductivity","valley-singlet pairing","topological superconductor","Chern number","spin-polarized Cooper pairs","phase diagram"],"falsifier":"Measure the thermal Hall conductance of a proximitized Mn3Ge device while sweeping the gate voltage; the model predicts a distinct quantized plateau at each topological phase, and the complete absence of the predicted valley-singlet phase at the experimental parameters would rule the model out.","tokens_in":546,"feed_emoji":"🧲","tokens_out":9939,"duration_ms":94871,"temperature":0.7,"pith_summary":"This paper asks whether the spin-polarized superconductivity recently reported in the chiral kagome antiferromagnet Mn3Ge can be understood from a minimal model. The paper argues that a tight-binding model with the three-sublattice magnetic order and a proximity-induced pairing term produces a valley-singlet superconducting phase exactly in the parameter range suggested by the experiments. At larger spin canting the model becomes a Chern insulator, and at other chemical potentials it hosts topological superconducting phases with Bogoliubov–de Gennes Chern numbers ${\\cal C}_{\\rm BdG} = \\pm 1$ and $\\pm 3$. If the model is right, proximity superconductivity in kagome antiferromagnets is a controllable route to spin-polarized Cooper pairs and topological superconducting states.","feed_headline":"Kagome antiferromagnet model predicts topological superconductivity","feed_subtitle":"A valley-singlet superconductor appears at Mn3Ge parameters; Chern-number ±1, ±3 phases at others.","key_machinery":"The central object is a minimal tight-binding model on the three-sublattice kagome lattice with an all-in/all-out spin configuration — the pattern in which every triangular plaquette has its magnetic moments pointing all inward or all outward — the magnetic order of Mn3Ge. Proximity to a conventional superconductor is encoded as an $s$-wave pairing term, and the analysis uses the Bogoliubov–de Gennes formalism. The phase diagram is organized by the BdG Chern number ${\\cal C}_{\\rm BdG}$, a topological invariant that counts chiral edge modes. The pairing mechanism that leads to spin-polarized Cooper pairs is the valley degree of freedom: the low-energy bands come in two valleys, and the pairing is valley-singlet, i.e., antisymmetric under exchange of the two valleys, which the authors associate with the superconducting phase seen in the Mn3Ge experiments.","core_discovery":"The central claim is that a minimal model of a chiral kagome antiferromagnet in contact with a conventional superconductor captures the proximity-induced superconductivity observed in Mn3Ge and predicts additional phases beyond it. The phase diagram, computed as a function of chemical potential and out-of-plane spin canting, contains a valley-singlet superconducting phase that appears at the chemical potentials and canting consistent with experiment, a Chern insulator at larger canting, and topological superconducting phases with BdG Chern numbers ${\\cal C}_{\\rm BdG} = \\pm 1$ and $\\pm 3$ elsewhere. The valley-singlet phase is the one associated with the observed spin-polarized proximity effect, and the topological phases establish the same material platform as a candidate for chiral Majorana edge modes.","pith_inferences":["A natural extension is to test the canting dependence by applying an in-plane or out-of-plane magnetic field (or strain) to a proximitized Mn3Ge film and looking for the predicted superconductor-to-Chern-insulator transition.","The existence of a $\\pm 3$ Chern superconducting phase suggests that kagome antiferromagnets could realize higher-Chern-number topological superconductivity in a single material, which may ease constraints on fabricating multi-channel Majorana devices.","If the valley-singlet identification is correct, it implies that conventional s-wave proximity can induce effective spin-triplet pairing whenever the normal-state bands are spin-split by the antiferromagnetic order, without requiring an explicit triplet pairing term."],"forward_implications":["At the chemical potentials and canting inferred for Mn3Ge, the model predicts a valley-singlet superconducting phase, identifying the pairing channel of the observed proximity effect.","Increasing the spin canting drives a transition into a Chern insulator, so a single proximitized kagome device might be switched between superconducting and insulating topological states by tuning the moments.","At other chemical potentials, the model predicts topological superconducting phases with Chern numbers $\\pm 1$ and $\\pm 3$, which would host chiral Majorana edge modes.","The valley-singlet pairing channel offers a concrete way to create spin-polarized Cooper pairs from a conventional superconductor, making the system relevant for superconducting spintronics."],"supporting_citations":[],"fun_headline_variants":["Proximity superconductivity in kagome antiferromagnets yields Chern phases","Valley-singlet superconductor from Mn3Ge kagome antiferromagnet","Kagome antiferromagnet hosts topological superconducting phases","Modeling Mn3Ge: spin-polarized superconductivity and Chern states","From valley singlet to Chern insulator in kagome antiferromagnet"],"cache_read_input_tokens":3200,"weakest_assumption_plain":"The prediction depends on the assumption that this minimal tight-binding model with its idealized all-in/all-out order and simple s-wave pairing reproduces the essential band structure and pairing physics of the real Mn3Ge–superconductor interface.","fun_headline_variants_meta":{"raw":{"variants":["Proximity superconductivity in kagome antiferromagnets yields Chern phases","Valley-singlet superconductor from Mn3Ge kagome antiferromagnet","Kagome antiferromagnet hosts topological superconducting phases","Modeling Mn3Ge: spin-polarized superconductivity and Chern states","From valley singlet to Chern insulator in kagome antiferromagnet"]},"model":"deepseek-v4-flash","effort":"low","cost_usd":0.000753,"raw_usage":{"total_tokens":3298,"prompt_tokens":839,"completion_tokens":2459,"prompt_tokens_details":{"cached_tokens":384},"prompt_cache_hit_tokens":384,"prompt_cache_miss_tokens":455,"completion_tokens_details":{"reasoning_tokens":2358}},"tokens_in":455,"tokens_out":2459,"duration_ms":16310,"temperature":1.0,"reasoning_tokens":2358,"cache_read_input_tokens":384,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-08-15T17:34:49.509123+00:00","model_set":{"reader":"deepseek-v4-flash"},"falsifier":"Measure the thermal Hall conductance of a proximitized Mn3Ge device while sweeping the gate voltage; the model predicts a distinct quantized plateau at each topological phase, and the complete absence of the predicted valley-singlet phase at the experimental parameters would rule the model out.","supporting_citations":[],"review_version":1}