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Chiral spin modes (CSMs) are collective spin excitations that arise from such interplay and connect states with opposite chirality. Here, we report a gate-tunable CSM that occurs between conduction SOC-split minibands in near-0\u00b0-twisted WSe\n                    <jats:sub>2<\/jats:sub>\n                    \/WS\n                    <jats:sub>2<\/jats:sub>\n                    bilayers. This mode manifests as a sharp resonance with giant Raman efficiency in the pseudovector-symmetry channel of the Raman spectra. By varying the filling, the CSM transitions from a chiral spin exciton to an excitonic polaron. The spin-flip nature is directly confirmed by the Zeeman effect, and the filling dependence indicates a charge-transfer insulator at unity filling. Our results demonstrate that transition metal\u2013dichalcogenide moir\u00e9 superlattices are a fertile platform for exploring exotic low-lying collective excitations.\n                  <\/jats:p>","DOI":"10.1126\/science.adq6530","type":"journal-article","created":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T18:03:06Z","timestamp":1792087386000},"page":"316-320","update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":0,"title":["Gate-tunable chiral spin mode in WSe\n                    <sub>2<\/sub>\n                    \/WS\n                    <sub>2<\/sub>\n                    moir\u00e9 superlattices"],"prefix":"10.1126","volume":"394","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-6007-3263","authenticated-orcid":true,"given":"Zhexu","family":"Shan","sequence":"first","affiliation":[{"name":"School of Physics, Zhejiang University, Hangzhou, China."},{"name":"Zhejiang Key Laboratory of Micro-Nano Quantum Chips and Quantum Control, Zhejiang University, Hangzhou, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-7223-7320","authenticated-orcid":true,"given":"Wenjian","family":"Su","sequence":"additional","affiliation":[{"name":"School of Physics, Zhejiang University, Hangzhou, China."},{"name":"Zhejiang Key Laboratory of Micro-Nano Quantum Chips and Quantum Control, Zhejiang University, Hangzhou, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3701-8119","authenticated-orcid":true,"given":"Kenji","family":"Watanabe","sequence":"additional","affiliation":[{"name":"Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Japan."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1467-3105","authenticated-orcid":true,"given":"Takashi","family":"Taniguchi","sequence":"additional","affiliation":[{"name":"Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Japan."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shiyao","family":"Zhu","sequence":"additional","affiliation":[{"name":"School of Physics, Zhejiang University, Hangzhou, China."},{"name":"Zhejiang Key Laboratory of Micro-Nano Quantum Chips and Quantum Control, Zhejiang University, Hangzhou, China."},{"name":"State Key Laboratory for Extreme Photonics and Instrumentation, Zhejiang University, Hangzhou, China."},{"name":"College of Optical Science and Engineering, Zhejiang University, Hangzhou, China."},{"name":"Hefei National Laboratory, Hefei, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1390-2308","authenticated-orcid":true,"given":"Yuanfeng","family":"Xu","sequence":"additional","affiliation":[{"name":"School of Physics, Zhejiang University, Hangzhou, China."},{"name":"Center for Correlated Matter, Zhejiang University, Hangzhou, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0840-8305","authenticated-orcid":true,"given":"Yanhao","family":"Tang","sequence":"additional","affiliation":[{"name":"School of Physics, Zhejiang University, Hangzhou, China."},{"name":"Zhejiang Key Laboratory of Micro-Nano Quantum Chips and Quantum Control, Zhejiang University, Hangzhou, China."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"221","reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1146\/annurev-conmatphys-020911-125138"},{"key":"e_1_3_2_3_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.109.227201"},{"key":"e_1_3_2_4_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.71.165329"},{"key":"e_1_3_2_5_2","volume-title":"Magnetization Oscillations and Waves","author":"Gurevich A. 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