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Photoelectron intensity maps are in good agreement with ab\u2010initio calculations of the band structure. The effective mass is  and  for holes and electrons, respectively. In the photoexcited state, spin\u2010orbit splitting of the conduction band cannot be resolved. This sets the upper bound of photoinduced Rashba coupling to  eV\u00c5. The correlated electron\u2010hole plasma evolves in Wannier excitons with Bohr radius of 2.8 nm, while no sign of self\u2010trapping in small polarons is found within the investigated time window of up to 120 ps following photoexcitation.<\/jats:p>","DOI":"10.1002\/smll.202511410","type":"journal-article","created":{"date-parts":[[2026,3,8]],"date-time":"2026-03-08T21:26:06Z","timestamp":1773005166000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["About Carrier's Self\u2010Trapping and Dynamical Rashba Splitting in the 2D Hybrid Perovskite (BA)\n                    <sub>2<\/sub>\n                    (MA)\n                    <sub>2<\/sub>\n                    Pb\n                    <sub>3<\/sub>\n                    l\n                    <sub>10<\/sub>"],"prefix":"10.1002","volume":"22","author":[{"given":"Weiyan","family":"Qi","sequence":"first","affiliation":[{"name":"Laboratoire des Solides Irradi\u00e9s, 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