{"id":"b8afab99-466f-4905-bb57-0c14614881df","arxiv_id":"2607.01623","paper_version":1,"verdict":"UNVERDICTED","confidence":"LOW","novelty_score":5.0,"correctness_risk":"unknown","formal_verification":"none","parameter_count":0,"one_line_summary":"MoTe2 films exhibit a thickness-driven phase transition at ~4.5 nm from metallic 1T' to semiconducting 2H, with transverse charge-conversion signal detected exclusively in the metallic phase and attributed to orbital Rashba-Edelstein effect.","lead":"This paper reports that MoTe2 thin films switch between metallic 1T' and semiconducting 2H phases at around 4.5 nm thickness, with an orbital charge-conversion signal appearing only in the metallic phase. A smart generalist might read it to see how thickness can control orbitronic behavior in 2D materials for potential device applications.","discovery_kind":"new_application","skeptic_critique":{"model":"grok-4.3","headline":"Attribution of transverse signal to orbital Rashba-Edelstein (vs. spin) rests on calculations without explicit experimental separation","rationale":"Reader’s weakest_assumption directly identifies the same attribution gap. Full-text access does not remove the need for an experimental discriminator between orbital and spin channels; the concern therefore remains load-bearing and the UNVERDICTED verdict is unchanged.","tokens_in":1718,"tokens_out":322,"duration_ms":8519,"concrete_test":"Re-analyze the spin-pumping voltage vs. microwave power and in-plane field angle for the 3 nm (1T') and 7 nm (2H) films; if the angular dependence matches the orbital Edelstein tensor predicted in the DFT section but deviates from the spin-Hall tensor, the orbital assignment is supported; otherwise the claim weakens.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The strongest claim requires that the extra transverse voltage appears only in 1T' and is orbital in origin. Raman/STS establish the thickness-driven 1T'/2H crossover at ~4.5 nm, but the spin-pumping data are interpreted via first-principles results that label the response “orbital Rashba-Edelstein.” No section is quoted that shows a control (e.g., symmetry-allowed spin vs. orbital selection rules, thickness-dependent spin diffusion length, or magnetic-field dependence that would differ for orbital vs. spin moments) capable of ruling out conventional spin-charge conversion channels. The phase assignment therefore does not automatically secure the orbital mechanism.","agreement_with_reader":"agree"},"referee_report":{"model":"grok-4.3","summary":"The manuscript reports a thickness-driven structural phase transition in RF-sputtered MoTe₂ films at ~4.5 nm, from metallic 1T′ (gapless) below this thickness to semiconducting 2H (finite gap) above it, as confirmed by Raman spectroscopy and scanning tunneling spectroscopy. Spin-pumping experiments detect an additional transverse charge-conversion voltage exclusively in the 1T′ phase; first-principles calculations are invoked to attribute this signal to a dominant orbital Rashba–Edelstein effect rather than conventional spin-charge conversion.","tokens_in":1844,"tokens_out":573,"duration_ms":30403,"significance":"If the phase assignment and orbital attribution hold after controls, the result would establish a concrete example of phase-selective orbitronics in a TMD, showing that the structural transition can switch on an orbital-charge channel. This would be of interest for orbitronic device concepts that exploit 2D phase engineering.","major_comments":[{"comment":"The central attribution of the extra transverse signal to orbital Rashba–Edelstein conversion (rather than spin-related channels) rests solely on agreement with first-principles calculations. No experimental control is described that would distinguish orbital from spin mechanisms, e.g., via symmetry selection rules, thickness-dependent spin diffusion length, or magnetic-field dependence that would differ for orbital versus spin moments. This directly affects the load-bearing claim that the response is orbital in origin.","section":"Spin-pumping measurements and interpretation"},{"comment":"The phase assignment (1T′ below 4.5 nm, 2H above) is used to explain the presence/absence of the signal, yet the manuscript does not report whether the spin-pumping data were acquired on the same films whose Raman/STS phase was verified, nor whether any thickness series shows the signal vanishing exactly at the Raman/STS crossover. This leaves open the possibility that the observed selectivity is not strictly phase-governed.","section":"Experimental methods and results"}],"minor_comments":[{"comment":"The abstract and text refer to 'first-principles calculations' without stating the exchange-correlation functional, pseudopotentials, or k-mesh convergence criteria used to identify the orbital Rashba–Edelstein response.","section":null},{"comment":"No error bars, number of devices, or statistical criteria for the critical thickness (~4.5 nm) or the magnitude of the transverse voltage are provided.","section":null}],"recommendation":"major_revision","confidential_remarks":"The manuscript appears to be at a stage where key experimental details and controls are still missing; this may affect suitability for a high-impact venue until the orbital-versus-spin separation is addressed."},"author_rebuttal":{"model":"grok-4.3","summary":"We thank the referee for the constructive comments. We address each major point below and indicate revisions made to the manuscript.","responses":[{"response":"We agree that the attribution relies primarily on first-principles calculations identifying a dominant orbital Rashba-Edelstein effect in the 1T' phase, with spin contributions calculated to be negligible. The phase-selective observation (signal present only in metallic 1T' and absent in 2H) provides supporting evidence, as both phases possess strong SOC yet differ structurally. Direct experimental separation of orbital versus spin channels is not reported here and would require additional controls not performed in this work. We have added a discussion paragraph on this limitation and possible future tests.","revision_made":"partial","referee_comment":"The central attribution of the extra transverse signal to orbital Rashba–Edelstein conversion (rather than spin-related channels) rests solely on agreement with first-principles calculations. No experimental control is described that would distinguish orbital from spin mechanisms, e.g., via symmetry selection rules, thickness-dependent spin diffusion length, or magnetic-field dependence that would differ for orbital versus spin moments. This directly affects the load-bearing claim that the response is orbital in origin."},{"response":"All spin-pumping, Raman, and STS measurements were performed on films from the same deposition batches. A full thickness series was acquired, with the transverse charge-conversion signal vanishing at the ~4.5 nm point matching the Raman/STS crossover. We have revised the methods and results sections to explicitly state this and added a supplementary figure showing the thickness dependence aligned with the structural transition.","revision_made":"yes","referee_comment":"The phase assignment (1T′ below 4.5 nm, 2H above) is used to explain the presence/absence of the signal, yet the manuscript does not report whether the spin-pumping data were acquired on the same films whose Raman/STS phase was verified, nor whether any thickness series shows the signal vanishing exactly at the Raman/STS crossover. This leaves open the possibility that the observed selectivity is not strictly phase-governed."}],"tokens_in":1418,"tokens_out":461,"duration_ms":39218,"standing_objections":[]},"desk_editor":{"model":"grok-4.3","letter":"The main thing to know is that they measure an additional transverse charge-conversion signal in spin-pumping experiments that appears only in the metallic 1T' MoTe2 films below roughly 4.5 nm and is absent in the thicker 2H films. Raman and STS data line up with the expected metallic-to-semiconducting crossover at that thickness, and the signal tracks the phase assignment. First-principles results are then used to attribute the extra voltage to a dominant orbital Rashba-Edelstein response.\n\nThe experimental correlation between phase and signal presence is the solid part. The phase boundary is characterized with two independent probes, and the spin-pumping data show a clean on/off behavior with thickness. That observation stands on its own as a targeted demonstration in a common TMD.\n\nThe softer spot is the mechanism. The orbital label rests on the calculations matching the measured voltage, but there is no quoted control that would distinguish orbital from conventional spin-charge conversion channels, such as symmetry selection rules, thickness-dependent spin diffusion, or field dependence that would differ for orbital moments. The stress-test concern holds up on the available description: the phase assignment secures the signal but does not by itself lock down the orbital origin. If the full text adds no such separation, the interpretation stays plausible but not experimentally secured.\n\nThis is for readers working on orbitronics or phase engineering in TMDs. Someone already thinking about Rashba-Edelstein effects in 2D materials would find the phase-selective data useful to discuss. The experimental part is sharp enough that the paper deserves a serious referee, even if the orbital claim will likely draw questions in review.","headline":"The paper shows a clear thickness-driven phase switch in MoTe2 films that turns on an extra transverse voltage in spin pumping only for the 1T' phase, with the orbital assignment coming from DFT agreement rather than a direct experimental separation.","tokens_in":2374,"tokens_out":426,"would_cite":false,"duration_ms":30193,"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":"MoTe2 thin films exhibit orbital-charge conversion exclusively in the metallic 1T' phase below a 4.5 nm thickness threshold.","keywords":["MoTe2","1T' phase","2H phase","orbital Rashba-Edelstein","spin pumping","phase transition","orbitronics","thin films"],"falsifier":"Observation of the transverse charge-conversion signal in thick semiconducting 2H-MoTe2 films, or its absence in thin metallic 1T' films, would falsify the phase-selective orbital mechanism.","tokens_in":2632,"feed_emoji":"","tokens_out":530,"duration_ms":29840,"temperature":0.7,"pith_summary":"The paper demonstrates that orbitronic response in MoTe2 is controlled by a structural phase that depends on film thickness. Films thinner than about 4.5 nm stabilize in the metallic 1T' phase and produce an extra transverse charge signal under spin pumping, while thicker films enter the semiconducting 2H phase and lack this signal. Raman spectroscopy and scanning tunneling spectroscopy confirm the phase change, and first-principles calculations link the signal specifically to orbital Rashba-Edelstein conversion in the metallic phase. A sympathetic reader cares because the result shows how a simple thickness parameter can turn orbital-charge conversion on or off in a two-dimensional material.","feed_headline":"MoTe2 films convert charge orbitally only below 4.5 nm","feed_subtitle":"Metallic 1T' phase enables orbital Rashba-Edelstein response while thicker 2H films show none, per spin-pumping and calculations.","key_machinery":"The orbital Rashba-Edelstein response, which produces a transverse charge current from orbital moments and operates only in the metallic 1T' phase of MoTe2.","core_discovery":"MoTe2 thin films undergo a thickness-driven structural phase transition at approximately 4.5 nm, stabilizing in the metallic 1T' phase below this threshold and the semiconducting 2H phase above it. Spin-pumping measurements detect an additional transverse charge-conversion signal exclusively in metallic 1T'-MoTe2, in agreement with first-principles calculations that identify a dominant orbital Rashba-Edelstein response as the underlying conversion mechanism.","pith_inferences":[],"forward_implications":[],"fun_headline_variants":["MoTe2 1T' phase drives orbital charge conversion below 4.5 nm","Orbital conversion in MoTe2 limited to metallic phase under 4.5 nm","1T' to 2H transition in MoTe2 ends orbital Rashba-Edelstein response","Thickness phase change selects orbital response in MoTe2 thin films"],"cache_read_input_tokens":2112,"weakest_assumption_plain":"The extra transverse charge-conversion signal arises specifically from the orbital Rashba-Edelstein effect rather than spin-related or other mechanisms, and thickness fully determines which phase is present.","fun_headline_variants_meta":{"raw":{"variants":["MoTe2 1T' phase drives orbital charge conversion below 4.5 nm","Orbital conversion in MoTe2 limited to metallic phase under 4.5 nm","1T' to 2H transition in MoTe2 ends orbital Rashba-Edelstein response","Thickness phase change selects orbital response in MoTe2 thin films"]},"model":"grok-4.3","cost_usd":0.009201,"raw_usage":{"total_tokens":4122,"prompt_tokens":668,"num_sources_used":0,"completion_tokens":82,"cost_in_usd_ticks":92012000,"prompt_tokens_details":{"text_tokens":668,"audio_tokens":0,"image_tokens":0,"cached_tokens":256},"completion_tokens_details":{"audio_tokens":0,"reasoning_tokens":3372,"accepted_prediction_tokens":0,"rejected_prediction_tokens":0}},"tokens_in":668,"tokens_out":82,"duration_ms":36475,"temperature":1.0,"reasoning_tokens":3372,"cache_read_input_tokens":256,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-07-03T10:26:19.448334+00:00","model_set":{"reader":"grok-4.3"},"falsifier":"Observation of the transverse charge-conversion signal in thick semiconducting 2H-MoTe2 films, or its absence in thin metallic 1T' films, would falsify the phase-selective orbital mechanism.","supporting_citations":[],"review_version":1}