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Interfacial charge transfer in such stacks enables high-quality graphene plasmons, but the charge-doping is fixed by work-function differences between constituent layers. Ferroelectric substrates have been explored for non-volatile, switchable doping, yet oxide ferroelectrics yield only modest doping due to imperfect interfaces. Here, we report efficient charge transfer between graphene and the van der Waals ferroelectric CuInP\n                    <jats:sub>2<\/jats:sub>\n                    S\n                    <jats:sub>6<\/jats:sub>\n                    , where the atomically-sharp interface yields unexpectedly large doping and high-quality plasmons, despite orders-of-magnitude smaller polarizations compared to oxide ferroelectrics. Infrared nano-imaging directly visualizes graphene plasmons whose doping depends on the adjacent ferroelectric layer. Combined nano-infrared and piezoresponse force microscopies reveal that graphene doping and CuInP\n                    <jats:sub>2<\/jats:sub>\n                    S\n                    <jats:sub>6<\/jats:sub>\n                    polarization increase with thickness and saturate in tandem, linking charge-transfer doping and out-of-plane ferroelectricity. Our results establish ferroelectric-assisted charge-transfer plasmons in graphene\/CuInP\n                    <jats:sub>2<\/jats:sub>\n                    S\n                    <jats:sub>6<\/jats:sub>\n                    as a promising route to probe and control nanoscale ferroelectric textures.\n                  <\/jats:p>","DOI":"10.1038\/s41467-026-76909-2","type":"journal-article","created":{"date-parts":[[2026,8,17]],"date-time":"2026-08-17T17:13:26Z","timestamp":1786986806000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Ferroelectric-assisted charge-transfer plasmons in graphene\/CuInP2S6"],"prefix":"10.1038","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2891-0028","authenticated-orcid":false,"given":"Yinming","family":"Shao","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-9020-0803","authenticated-orcid":false,"given":"Hae Yeon","family":"Lee","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7830-3464","authenticated-orcid":false,"given":"Jin","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0306-2624","authenticated-orcid":false,"given":"S. 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