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However, the inherently weak vdW interactions enable facile sliding between layers, introducing complexities beyond those encountered in conventional ferroelectric materials and presenting substantial challenges in uncovering intricate switching pathways. Here, we combine atomic-resolution imaging under in situ electrical biasing conditions with first-principles calculations to unravel the atomic-scale switching mechanisms in SnSe, a vdW group IV monochalcogenide. Our results uncover the coexistence of a consecutive 90\u00b0 switching pathway and a direct 180\u00b0 switching pathway from antiferroelectric (AFE) to FE order in this vdW system. Atomic-scale investigations and strain analysis reveal that the switching processes simultaneously induce interlayer sliding and compressive strain, while the lattice remains coherent despite the presence of multidomain structures. These findings elucidate vdW ferroelectric switching dynamics at atomic scale and lay the foundation for the rational design of 2D ferroelectric nanodevices.<\/jats:p>","DOI":"10.1126\/sciadv.adw3295","type":"journal-article","created":{"date-parts":[[2025,10,3]],"date-time":"2025-10-03T17:59:16Z","timestamp":1759514356000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":6,"title":["Revealing atomic-scale switching pathways in van der Waals ferroelectrics"],"prefix":"10.1126","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3005-0151","authenticated-orcid":true,"given":"Xinyan","family":"Li","sequence":"first","affiliation":[{"name":"Department of Materials Science and NanoEngineering, Rice University, Houston, TX, USA."},{"name":"Rice Advanced Materials Institute, Rice University, Houston, TX, 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