{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T03:30:06Z","timestamp":1760239806588,"version":"build-2065373602"},"reference-count":52,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2020,12,31]],"date-time":"2020-12-31T00:00:00Z","timestamp":1609372800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100005739","name":"Universidad Nacional Autonoma de Mexico","doi-asserted-by":"publisher","award":["PAPIIT IN108620"],"award-info":[{"award-number":["PAPIIT IN108620"]}],"id":[{"id":"10.13039\/501100005739","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Symmetry"],"abstract":"<jats:p>Decoherence with recurrences appear in the dynamics of the one-body density matrix of an F=1 spinor Bose\u2013Einstein condensate, initially prepared in coherent states, in the presence of an external uniform magnetic field and within the single mode approximation. The phenomenon emerges as a many-body effect of the interplay of the quadratic Zeeman effect, which breaks the rotational symmetry, and the spin-spin interactions. By performing full quantum diagonalizations, a very accurate time evolution of large condensates is analyzed, leading to heuristic analytic expressions for the time dependence of the one-body density matrix, in the weak and strong interacting regimes, for initial coherent states. We are able to find accurate analytical expressions for both the decoherence and the recurrence times, in terms of the number of atoms and strength parameters, which show remarkable differences depending on the strength of the spin-spin interactions. The features of the stationary states in both regimes are also investigated. We discuss the nature of these limits in light of the thermodynamic limit.<\/jats:p>","DOI":"10.3390\/sym13010067","type":"journal-article","created":{"date-parts":[[2020,12,31]],"date-time":"2020-12-31T14:31:49Z","timestamp":1609425109000},"page":"67","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Intrinsic Decoherence and Recurrences in a Large Ferromagnetic F = 1 Spinor Bose\u2013Einstein Condensate"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1166-4529","authenticated-orcid":false,"given":"Juan Carlos","family":"Sandoval-Santana","sequence":"first","affiliation":[{"name":"Instituto de F\u00edsica, Universidad Nacional Aut\u00f3noma de M\u00e9xico, Apartado Postal 20-364, Ciudad de M\u00e9xico 01000, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0272-657X","authenticated-orcid":false,"given":"Roberto","family":"Zamora-Zamora","sequence":"additional","affiliation":[{"name":"Department of Applied Physics, QCD Labs, COMP Centre of Excellence, Aalto University, P.O. Box 13500, FI-00076 Aalto, Finland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rosario","family":"Paredes","sequence":"additional","affiliation":[{"name":"Instituto de F\u00edsica, Universidad Nacional Aut\u00f3noma de M\u00e9xico, Apartado Postal 20-364, Ciudad de M\u00e9xico 01000, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4987-1600","authenticated-orcid":false,"given":"Victor","family":"Romero-Roch\u00edn","sequence":"additional","affiliation":[{"name":"Instituto de F\u00edsica, Universidad Nacional Aut\u00f3noma de M\u00e9xico, Apartado Postal 20-364, Ciudad de M\u00e9xico 01000, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2020,12,31]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/B978-1-4832-3114-3.50007-6","article-title":"The theory of relaxation processes","volume":"Volume 1","author":"Redfield","year":"1965","journal-title":"Advances in Magnetic and Optical Resonance"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"119","DOI":"10.1007\/BF01608499","article-title":"On the generators of quantum dynamical semigroups","volume":"48","author":"Lindblad","year":"1976","journal-title":"Commun. 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