{"paper":{"title":"Mid-infrared Assisted THz Phonon Amplification in a 2D Semiconductor for Room Temperature Detection","license":"http://creativecommons.org/licenses/by/4.0/","headline":"Mid-infrared light directly amplifies out-of-plane phonons in few-layer MoS2 by more than 80% at room temperature.","cross_cats":["cond-mat.mes-hall","physics.optics"],"primary_cat":"physics.app-ph","authors_text":"Anju Sajan, Christopher Sumner, Fumin Huang, Jakob Ziewer, Rohit Chikkaraddy","submitted_at":"2026-05-14T17:35:13Z","abstract_excerpt":"Efficient and selective excitation of lattice vibrations is central to controlling energy flow at the nanoscale, yet remains challenging under conventional optical excitation. Here, we introduce a mid-infrared-assisted phonon amplification approach, termed MIRAPA, that enables efficient energy injection directly into vibrational bonds. Using surface-enhanced resonant Raman scattering in few-layer $\\mathrm{MoS_2}$, we exploit strong exciton--phonon coupling to monitor phonon populations. When mid-infrared (MIR) light is introduced, it couples directly to out-of-plane lattice vibrations, leading"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"When mid-infrared (MIR) light is introduced, it couples directly to out-of-plane lattice vibrations, leading to room-temperature phonon amplification exceeding 80%.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The mid-infrared light couples directly to vibrational bonds while bypassing electronic excitation pathways, with the observed Raman enhancement arising solely from increased phonon population rather than other optical or thermal effects.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Mid-infrared light directly amplifies out-of-plane phonons in few-layer MoS2 by over 80% at room temperature with 300x lower power density than visible light, yielding 0.3 nW/sqrt(Hz) noise-equivalent power for MIR detection.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Mid-infrared light directly amplifies out-of-plane phonons in few-layer MoS2 by more than 80% at room temperature.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"dc5b70411ca6de4447c53bbb0b0a4fd4cf6bc10ad9a59996af136c3706792f92"},"source":{"id":"2605.15123","kind":"arxiv","version":1},"verdict":{"id":"e7f5304c-621c-490d-8ac9-2b03807bb618","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-15T02:43:36.403364Z","strongest_claim":"When mid-infrared (MIR) light is introduced, it couples directly to out-of-plane lattice vibrations, leading to room-temperature phonon amplification exceeding 80%.","one_line_summary":"Mid-infrared light directly amplifies out-of-plane phonons in few-layer MoS2 by over 80% at room temperature with 300x lower power density than visible light, yielding 0.3 nW/sqrt(Hz) noise-equivalent power for MIR detection.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The mid-infrared light couples directly to vibrational bonds while bypassing electronic excitation pathways, with the observed Raman enhancement arising solely from increased phonon population rather than other optical or thermal effects.","pith_extraction_headline":"Mid-infrared light directly amplifies out-of-plane phonons in few-layer MoS2 by more than 80% at room temperature."},"references":{"count":7,"sample":[{"doi":"10.1103/revmodphys.79.175","year":2007,"title":"P .; Hackl, R","work_id":"0bfb9575-a854-4a50-a0c8-839517175ec1","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.1038/s41467-018-","year":2022,"title":"(27) Qi, P .; Dai, Y .; Luo, Y .; Tao, G.; Zheng, L.; Liu, D.; Zhang, T.; Zhou, J.; Shen, B.; Lin, F.; Liu, Z.; Fang, Z","work_id":"9b785ed5-73eb-4979-a170-9d5474570150","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.1038/s41377-022-00860-2","year":2023,"title":"(28) Dai, Y .; Qi, P .; Tao, G.; Yao, G.; Shi, B.; Liu, Z.; Liu, Z.; He, X.; Peng, P .; Dang, Z.; Zheng, L.; Zhang, T.; Gong, Y .; Guan, Y .; Liu, K.; Fang, Z","work_id":"f49276dd-0c1b-430d-9e6f-75ba9862088c","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.1038/s41377-","year":2019,"title":"Optical Bilayers","work_id":"79409d97-8364-4e4e-8656-08dd2839f189","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.1038/s41467-023-38483-9","year":2022,"title":"Picocavities","work_id":"b21f1638-afe5-41e9-9909-3c19a2d664ea","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":7,"snapshot_sha256":"c1f6dbba64ef33c6cace6c057fef62d71dc8e2d18da50ede69ad0703f2f9e50f","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}