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Our framework can be applied to a wide class of spin systems and Bell inequalities, to study whether nonlocality occurs naturally in quantum many-body systems close to the ground state. Moreover, we also show that the low-energy spectrum of the Bell operator associated to such systems can be well approximated by the one of a quantum harmonic oscillator, and that spin-squeezed states are optimal in displaying Bell correlations for such Bell inequalities.<\/jats:p>","DOI":"10.22331\/q-2018-11-19-107","type":"journal-article","created":{"date-parts":[[2018,11,19]],"date-time":"2018-11-19T14:54:47Z","timestamp":1542639287000},"page":"107","source":"Crossref","is-referenced-by-count":18,"title":["Bell correlations at finite temperature"],"prefix":"10.22331","volume":"2","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3653-0030","authenticated-orcid":false,"given":"Matteo","family":"Fadel","sequence":"first","affiliation":[{"name":"Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6123-1422","authenticated-orcid":false,"given":"Jordi","family":"Tura","sequence":"additional","affiliation":[{"name":"Max-Planck-Institut f\u00fcr Quantenoptik, Hans-Kopfermann-Stra\u00dfe 1, 85748 Garching, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"9598","published-online":{"date-parts":[[2018,11,19]]},"reference":[{"key":"0","doi-asserted-by":"crossref","unstructured":"J. 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