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However, active and energy\u2010efficient control of their formation and recombination remains elusive. Here we demonstrate an interface\u2010engineering strategy that enables magnetic control of interlayer excitons by inserting a monolayer ferromagnet, CrSe\n                    <jats:sub>2<\/jats:sub>\n                    , as an atomic\u2010scale spin\u2010valve spacer within a twisted WSe\n                    <jats:sub>2<\/jats:sub>\n                    homobilayer. At low temperature, the twisted WSe\n                    <jats:sub>2<\/jats:sub>\n                    bilayer supports highly efficient conversion from intralayer to interlayer excitons, providing a sensitive platform to probe interlayer charge transfer. Introducing CrSe\n                    <jats:sub>2<\/jats:sub>\n                    suppresses interlayer coupling and produces pronounced thermomagnetic signatures near the Curie temperature (\u223c65 K), evidencing strong coupling between magnetic fluctuations and exciton dynamics. Under external magnetic fields up to 9 T, the interlayer\u2010exciton emission is reversibly modulated while intralayer emission is enhanced, consistent with spin\u2010selective tunnelling that regulates interlayer charge transfer. First\u2010principles calculations support CrSe\n                    <jats:sub>2<\/jats:sub>\n                    \u2010mediated spin filtering and reveal stacking\u2010angle\u2010dependent charge transfer. These findings establish magnetic spin filtering as an effective strategy for manipulating excitonic states, opening pathways toward spin\u2013exciton hybrid architectures and quantum optoelectronic devices at the atomic scale.\n                  <\/jats:p>","DOI":"10.1002\/smll.74417","type":"journal-article","created":{"date-parts":[[2026,7,14]],"date-time":"2026-07-14T11:57:06Z","timestamp":1784030226000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Atomic\u2010Scale Spin\u2010Valve Control of Interlayer Excitons in Twisted WSe\n                    <sub>2<\/sub>\n                    \/CrSe\n                    <sub>2<\/sub>\n                    \/WSe\n                    <sub>2<\/sub>\n                    Heterostructures"],"prefix":"10.1002","volume":"22","author":[{"given":"Junying","family":"Chen","sequence":"first","affiliation":[{"name":"Institute of Quantum Physics School of Physics Central South University  Changsha Hunan People's Republic of China"},{"name":"State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South University  Changsha Hunan People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xing","family":"Xie","sequence":"additional","affiliation":[{"name":"Institute of Quantum Physics School of Physics Central South University  Changsha Hunan People's Republic of China"},{"name":"State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South University  Changsha Hunan People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shaofei","family":"Li","sequence":"additional","affiliation":[{"name":"Institute of Quantum Physics School of Physics Central South University  Changsha Hunan People's Republic of China"},{"name":"State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South University  Changsha Hunan People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zongwen","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Chemical and Biomolecular Engineering The University of Sydney  Sydney New South Wales Australia"},{"name":"The University of Sydney Nano Institute The University of Sydney  Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jian\u2010Tao","family":"Wang","sequence":"additional","affiliation":[{"name":"Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences  Beijing People's Republic of China"},{"name":"School of Physical Sciences University of Chinese Academy of Sciences  Beijing People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jun","family":"He","sequence":"additional","affiliation":[{"name":"Institute of Quantum Physics School of Physics Central South University  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