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The explicit expressions of eigenstates and eigenenergies make it possible to analytically unveil the occurrence of first-order quantum phase transitions. The latter are physically relevant since they are characterized by abrupt changes in the two-spin subsystem concurrence, in the net spin magnetization and in the mean photon number.<\/jats:p>","DOI":"10.3390\/e25020187","type":"journal-article","created":{"date-parts":[[2023,1,18]],"date-time":"2023-01-18T01:57:57Z","timestamp":1674007077000},"page":"187","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Superradiant Quantum Phase Transition for an Exactly Solvable Two-Qubit Spin-Boson Model"],"prefix":"10.3390","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2363-7699","authenticated-orcid":false,"given":"Roberto","family":"Grimaudo","sequence":"first","affiliation":[{"name":"Dipartimento di Fisica e Chimica \u201cEmilio Segr\u00e8\u201d, Group of Interdisciplinary Theoretical Physics, Universit\u00e0 degli Studi di Palermo, Viale delle Scienze Ed. 18, 90128 Palermo, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5496-1518","authenticated-orcid":false,"given":"Davide","family":"Valenti","sequence":"additional","affiliation":[{"name":"Dipartimento di Fisica e Chimica \u201cEmilio Segr\u00e8\u201d, Group of Interdisciplinary Theoretical Physics, Universit\u00e0 degli Studi di Palermo, Viale delle Scienze Ed. 18, 90128 Palermo, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3954-0445","authenticated-orcid":false,"given":"Alessandro","family":"Sergi","sequence":"additional","affiliation":[{"name":"Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Universit\u00e0 degli Studi di Messina, Viale F. Stagno d\u2019Alcontres 31, 98166 Messina, Italy"},{"name":"Institute of Systems Science, Durban University of Technology, P.O. Box 1334, Durban 4000, South Africa"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3367-0129","authenticated-orcid":false,"given":"Antonino","family":"Messina","sequence":"additional","affiliation":[{"name":"Dipartimento di Matematica ed Informatica, Universit\u00e0 degli Studi di Palermo, Via Archirafi 34, 90123 Palermo, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2023,1,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Breuer, H.P., and Petruccione, F. (2002). 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