{"id":"3ff616a3-df6e-4792-8415-201c01db9dd4","arxiv_id":"2606.29749","paper_version":1,"verdict":"UNVERDICTED","confidence":"LOW","novelty_score":5.0,"correctness_risk":"unknown","formal_verification":"none","parameter_count":0,"one_line_summary":"SPEM measurements show Cs-terminated surfaces of CsV3Sb5 have band structures closer to bulk with less inhomogeneity than Sb-terminated ones, with implications for CDW-related band folding and interface suitability.","lead":"This paper uses scanning photoemission microscopy to compare electronic band structures on Cs-terminated and Sb-terminated surfaces of the kagome superconductor CsV3Sb5. It reports termination-dependent modifications, reduced contrast below the CDW transition, and surface inhomogeneity linked to out-of-plane Sb disorders.","discovery_kind":"unclear","skeptic_critique":{"model":"grok-4.3","headline":"Causal attribution of Sb 5p inhomogeneity to out-of-plane Sb disorders is an untested interpretive step","rationale":"The load-bearing concern identified is identical to the reader's weakest_assumption. The observational nature of SPEM makes the causal interpretation the least secure element; full-text access does not remove this gap because the technique itself does not measure atomic structure. No other internal inconsistency or data-quality issue is apparent from the provided abstract and claim structure.","tokens_in":1801,"tokens_out":396,"duration_ms":28445,"concrete_test":"Acquire atomic-resolution STM topography on the identical Cs-terminated regions previously mapped by SPEM; quantify any spatial correlation between local Sb atom height variations or vacancies and the SPEM intensity inhomogeneity at Γ/A. If no statistically significant correlation is found (e.g., Pearson coefficient <0.3 across multiple fields of view), the disorder attribution is unsupported.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The paper's key interpretive claim (abstract final paragraph and reader's weakest_assumption) is that the observed spatial inhomogeneity in the Sb 5p band on the Cs-terminated surface arises specifically from disorders of the out-of-plane Sb atoms and is directly relevant to CDW-induced band folding along Γ-A. SPEM maps photoemission intensity and dispersion variations across the surface but provides no direct structural information on atomic positions, displacements, or defect types. The selective impact at Γ/A (significant), K/H (noticeable), and M/L (negligible) is reported, yet the causal mechanism linking these electronic variations to out-of-plane Sb disorder (as opposed to other possible sources such as surface reconstruction, adsorbates, or bulk CDW domains) remains an assumption. This step is load-bearing because the recommendation that Cs termination is preferable for interfaces rests on understanding and mitigating this inhomogeneity's origin and its effect on Sb 5p-V 3d hybridization.","agreement_with_reader":"agree"},"referee_report":{"model":"grok-4.3","summary":"The manuscript reports scanning photoemission spectromicroscopy (SPEM) measurements comparing the electronic band structures of Cs- and Sb-terminated surfaces of the kagome superconductor CsV₃Sb₅. The Cs-terminated surface shows bands closer to bulk expectations, while the Sb-terminated surface exhibits substantial modifications near the K/H Brillouin zone point. Below the CDW transition temperature the termination contrast decreases, yet the Sb 5p band on the Cs-terminated region displays increasing spatial inhomogeneity; this is interpreted as arising from out-of-plane Sb disorders and as relevant to CDW-induced band folding along Γ-A. The authors conclude that the less inhomogeneous Cs termination is preferable for interfaces, while noting that residual inhomogeneity (significant at Γ/A, noticeable at K/H, negligible at M/L) may still affect Sb 5p-V 3d hybridization.","tokens_in":1965,"tokens_out":489,"duration_ms":54124,"significance":"If the reported spatial maps hold, the work supplies direct spectromicroscopic evidence of termination-dependent electronic inhomogeneity in a kagome superconductor, with potential implications for interface engineering in superconducting devices. The experimental approach provides spatially resolved intensity and dispersion data referenced to standard Brillouin zone points and the known CDW temperature, offering a concrete basis for comparing surface quality without reliance on fitted parameters or self-referential predictions.","major_comments":[{"comment":"Abstract, final paragraph: the interpretive claim that 'the inhomogeneity of the Sb 5p band would be related to disorders of the out-of-plane Sb' and is 'relevant for the band folding along Γ-A with the charge density wave' lacks direct structural support; SPEM maps electronic intensity and dispersion but supplies no atomic-position or defect-type information, leaving the causal link to out-of-plane Sb disorder (as opposed to surface reconstruction, adsorbates, or CDW domains) untested. This step is load-bearing for the interface-suitability recommendation.","section":"Abstract, final paragraph"}],"minor_comments":[{"comment":"Abstract: quantitative measures of inhomogeneity (e.g., standard deviations, spatial correlation lengths, or error bars on band-position shifts) and details of data-processing steps are absent, which would improve clarity of the observational claims.","section":"Abstract"}],"recommendation":"major_revision","confidential_remarks":null},"author_rebuttal":{"model":"grok-4.3","summary":"We thank the referee for the constructive review. The single major comment concerns the strength of an interpretive claim in the abstract; we address it directly below and agree that a revision is warranted.","responses":[{"response":"We agree that the original phrasing presents the connection as more definitive than warranted by the SPEM data alone. The manuscript infers a possible link from the temperature-dependent increase in inhomogeneity on the Cs-terminated surface (which tracks the CDW transition) together with the known out-of-plane Sb positions in the crystal structure, but no direct structural or defect imaging is provided. We will revise the abstract (and corresponding sentences in the main text) to read that the inhomogeneity 'may be related to disorders of the out-of-plane Sb' and 'could be relevant for the band folding along Γ-A'. The interface recommendation rests on the measured lower spatial inhomogeneity of the Cs termination relative to the Sb termination, which is independent of the precise microscopic origin of the residual inhomogeneity.","revision_made":"yes","referee_comment":"[Abstract, final paragraph] Abstract, final paragraph: the interpretive claim that 'the inhomogeneity of the Sb 5p band would be related to disorders of the out-of-plane Sb' and is 'relevant for the band folding along Γ-A with the charge density wave' lacks direct structural support; SPEM maps electronic intensity and dispersion but supplies no atomic-position or defect-type information, leaving the causal link to out-of-plane Sb disorder (as opposed to surface reconstruction, adsorbates, or CDW domains) untested. This step is load-bearing for the interface-suitability recommendation."}],"tokens_in":1439,"tokens_out":354,"duration_ms":26032,"standing_objections":[]},"desk_editor":{"model":"grok-4.3","letter":"The main takeaway is that this paper reports SPEM maps showing the Cs-terminated surface of CsV3Sb5 has bands closer to bulk expectations while the Sb-terminated one is modified around K/H, plus some momentum-dependent inhomogeneity on the Cs side that changes with temperature below the CDW transition. Those specific contrasts and their evolution are new observational results.\n\nThe work does a straightforward job of documenting the termination-dependent differences and the point-by-point variations across the surface. The reduction in contrast below the transition temperature and the slight increase in inhomogeneity on Cs are concrete findings that add to what was known from other techniques.\n\nThe soft spot is the causal step in the abstract's final paragraph. The authors attribute the Sb 5p inhomogeneity on the Cs termination to disorders of out-of-plane Sb atoms and tie it to band folding along Gamma-A. SPEM measures photoemission intensity and dispersion, so it registers electronic variations but does not directly image atomic positions, displacements, or defect types. Other sources such as surface reconstruction or adsorbates could produce similar patterns, and the selective strength at Gamma/A versus K/H versus M/L is reported without a structural measurement to confirm the mechanism. That assumption carries weight because it supports the claim that the Cs termination is preferable for interfaces.\n\nThis paper is for experimentalists already working on kagome superconductors or surface-sensitive probes of these materials. Someone in that niche would get value from the termination-specific maps and the temperature trends. It is not a broad advance but the data are fresh enough to be worth checking.\n\nI would send it for peer review. The observations are worth referee scrutiny even if the interpretive link needs more support from complementary structural data.","headline":"New SPEM maps of terminations in CsV3Sb5 are the real addition, but the link from inhomogeneity to out-of-plane Sb disorder is assumed rather than measured.","tokens_in":2532,"tokens_out":424,"would_cite":false,"duration_ms":41356,"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":"Cs-terminated surfaces of CsV3Sb5 show less electronic inhomogeneity than Sb-terminated ones and are more suitable for kagome superconductor interfaces.","keywords":["CsV3Sb5","kagome superconductor","surface termination","scanning photoemission microscopy","charge density wave","electronic inhomogeneity","Sb 5p band","band folding"],"falsifier":"High-resolution structural imaging or atomically resolved spectroscopy that directly correlates the positions or displacements of out-of-plane Sb atoms with the measured spatial variations in Sb 5p band intensity or energy across the Cs-terminated surface.","tokens_in":2678,"feed_emoji":"🔬","tokens_out":763,"duration_ms":39871,"temperature":0.7,"pith_summary":"Scanning photoemission microscopy maps the electronic structures of Cs- and Sb-terminated surfaces in the kagome superconductor CsV3Sb5. The Cs-terminated surface band structure remains close to bulk, while the Sb-terminated surface is substantially modified near the K/H point. Below the charge density wave transition temperature the contrast between terminations decreases, yet the Sb 5p band on Cs-terminated regions exhibits electronic inhomogeneity that slightly increases and is linked to out-of-plane Sb disorders. This inhomogeneity influences band folding along Γ-A and is expected to affect Sb 5p-V 3d hybridization at the interface, with the effect strongest at Γ/A, noticeable at K/H, and negligible at M/L. The results therefore identify Cs termination as the less inhomogeneous option for interfaces.","feed_headline":"Cs termination less inhomogeneous than Sb in CsV3Sb5 surfaces","feed_subtitle":"SPEM maps show Cs termination is preferable for interfaces while its inhomogeneity still affects hybridization at Γ/A and K/H points.","key_machinery":"Scanning photoemission spectromicroscopy (SPEM) that spatially resolves band structures and inhomogeneities across Cs- and Sb-terminated surface regions in momentum space.","core_discovery":"The SPEM results show that the Cs-terminated surface band structure is rather close to the bulk while the Sb-terminated one is substantially modified around K/H; the Sb 5p band of the Cs-terminated region exhibits electronic inhomogeneity related to disorders of the out-of-plane Sb atoms that is relevant for the band folding along Γ-A with the charge density wave, and the less inhomogeneous Cs termination is more suitable for interfaces although its inhomogeneity affects Sb 5p-V 3d hybridization.","pith_inferences":["Surface preparation methods that favor uniform Cs termination could improve interface quality in devices based on kagome superconductors.","Because the inhomogeneity ties to CDW band folding, similar surface effects may influence the superconducting gap or other low-temperature electronic properties.","Direct measurements on fabricated heterostructures using Cs-terminated surfaces would test whether the reduced inhomogeneity translates to better interface performance."],"forward_implications":["The less inhomogeneous Cs termination is more suitable for interfaces of kagome superconductors.","Inhomogeneity on the Cs-terminated surface affects Sb 5p-V 3d hybridization at the interface, significant at Γ/A, noticeable at K/H, and negligible at M/L.","The inhomogeneity of the Sb 5p band on the Cs-terminated surface slightly increases below the charge density wave transition temperature.","The contrast between Cs- and Sb-terminated regions is reduced below the charge density wave transition temperature."],"fun_headline_variants":["Cs termination in CsV3Sb5 closer to bulk band than Sb","SPEM detects band modification at K/H on Sb-terminated CsV3Sb5","CsV3Sb5 Sb termination shows more inhomogeneity than Cs","Cs termination inhomogeneity affects hybridization in CsV3Sb5","SPEM maps CsV3Sb5 surface band differences at K/H and Gamma-A"],"cache_read_input_tokens":64,"weakest_assumption_plain":"The observed electronic inhomogeneity of the Sb 5p band on the Cs-terminated surface is caused by disorders of the out-of-plane Sb atoms.","fun_headline_variants_meta":{"raw":{"variants":["Cs termination in CsV3Sb5 closer to bulk band than Sb","SPEM detects band modification at K/H on Sb-terminated CsV3Sb5","CsV3Sb5 Sb termination shows more inhomogeneity than Cs","Cs termination inhomogeneity affects hybridization in CsV3Sb5","SPEM maps CsV3Sb5 surface band differences at K/H and Gamma-A"]},"model":"grok-4.3","cost_usd":0.00529,"raw_usage":{"total_tokens":2570,"prompt_tokens":693,"num_sources_used":0,"completion_tokens":96,"cost_in_usd_ticks":52899500,"prompt_tokens_details":{"text_tokens":693,"audio_tokens":0,"image_tokens":0,"cached_tokens":256},"completion_tokens_details":{"audio_tokens":0,"reasoning_tokens":1781,"accepted_prediction_tokens":0,"rejected_prediction_tokens":0}},"tokens_in":693,"tokens_out":96,"duration_ms":25048,"temperature":1.0,"reasoning_tokens":1781,"cache_read_input_tokens":256,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-06-30T04:28:24.061343+00:00","model_set":{"reader":"grok-4.3"},"falsifier":"High-resolution structural imaging or atomically resolved spectroscopy that directly correlates the positions or displacements of out-of-plane Sb atoms with the measured spatial variations in Sb 5p band intensity or energy across the Cs-terminated surface.","supporting_citations":[],"review_version":1}