{"paper":{"title":"Anisotropic electron-phonon coupling and chiral phonons in van der Waals room temperature ferromagnet Fe$_{5}$GeTe$_{2}$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Raman tilt reveals anisotropic electron-phonon coupling and chiral phonons in Fe5GeTe2","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Andrzej Ptok, Anushree Roy, Changgu Lee, Jyoti Saini, Smrutiranjan Mekap, Subhasis Ghosh","submitted_at":"2025-12-22T22:35:20Z","abstract_excerpt":"The layered van der Waals Fe$_5$GeTe$_2$ (F5GT) compound exhibits room-temperature ferromagnetism, making it a promising candidate for technological applications. In our study, combined temperature, wavelength, and polarization-dependent Raman measurements, along with {\\it ab initio} calculations reveal important aspects of lattice dynamics and electron-phonon interactions. The angle-resolved Raman intensity under linear polarization configurations exhibits a strong tilt in the laboratory coordinate system, indicating the existence of anisotropic electron-phonon coupling. The temperature evolu"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"The angle-resolved Raman intensity under linear polarization configurations exhibits a strong tilt indicating the existence of anisotropic electron-phonon coupling, and cross-circularly polarized Raman measurements provide direct spectroscopic evidence for chiral vibrational modes.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The observed tilt in angle-resolved Raman intensity is caused by anisotropic electron-phonon coupling rather than sample misalignment, surface effects, or instrumental polarization artifacts.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Raman measurements and ab initio calculations show anisotropic electron-phonon coupling and chiral phonons in room-temperature ferromagnetic Fe5GeTe2.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Raman tilt reveals anisotropic electron-phonon coupling and chiral phonons in Fe5GeTe2","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"6c91c341ff4e7beb55240f2b0acc61961af1942a8c0e09dfacd5fa968fffc4a8"},"source":{"id":"2512.19910","kind":"arxiv","version":2},"verdict":{"id":"66fe141b-9ad4-4154-b905-e1effa67a2bb","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-16T20:00:03.472150Z","strongest_claim":"The angle-resolved Raman intensity under linear polarization configurations exhibits a strong tilt indicating the existence of anisotropic electron-phonon coupling, and cross-circularly polarized Raman measurements provide direct spectroscopic evidence for chiral vibrational modes.","one_line_summary":"Raman measurements and ab initio calculations show anisotropic electron-phonon coupling and chiral phonons in room-temperature ferromagnetic Fe5GeTe2.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The observed tilt in angle-resolved Raman intensity is caused by anisotropic electron-phonon coupling rather than sample misalignment, surface effects, or instrumental polarization artifacts.","pith_extraction_headline":"Raman tilt reveals anisotropic electron-phonon coupling and chiral phonons in Fe5GeTe2"},"references":{"count":114,"sample":[{"doi":"","year":2021,"title":"J. F. Sierra, J. Fabian, R. K. Kawakami, S. Roche, and S. O. Valenzuela, Van der Waals heterostructures for spintronics and opto-spintronics, Nat. Nanotechnol.16, 856 (2021)","work_id":"38cfb51b-010d-48b9-8e82-407c7c972251","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2021,"title":"S. Yang, T. Zhang, and C. Jiang, van der Waals mag- nets: Material family, detection and modulation of mag- netism, and perspective in spintronics, Adv. Sci.8, 2002488 (2021)","work_id":"d607611c-9fd0-40fd-b105-9d0571f894e9","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2024,"title":"J. T. Gish, D. Lebedev, T. W. Song, V. K. Sangwan, and M. C. Hersam, Van der Waals opto-spintronics, Nat. Electron.7, 336 (2024)","work_id":"ed005939-6722-4dc7-8243-203d6599374b","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2025,"title":"Z. Zhao, Y. Lin, and A. Avsar, Novel spintronic effects in two-dimensional van der Waals heterostructures, npj 2D Mater. Appl.9, 30 (2025)","work_id":"99bcf0d4-418b-4757-bea6-2bdd49311852","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2018,"title":"K. Kim, J. Seo, E. Lee, K.-T. Ko, B. S. Kim, B. G. Jang, J. M. Ok, J. Lee, Y. J. Jo, W. Kang, J. H. Shim, C. Kim, H. W. Yeom, B. Il Min, B.-J. Yang, and J. S. Kim, Large anomalous Hall current induced","work_id":"920c4ef5-9dac-4dc4-ba74-6addb5d31993","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":114,"snapshot_sha256":"195bc02945d22673e9b0c5e234bb1508f223b454e2d98789454604c3b23c5614","internal_anchors":0},"formal_canon":{"evidence_count":2,"snapshot_sha256":"f0104d897e8cb313756a178e4ccf2b7762f7a6d05b75c51a8184702389f255dc"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}