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Electrocaloric effect in cubic Hubbard nanoclusters

dc.contributor.authorBalcerzak, Tadeusz
dc.contributor.authorSzałowski, Karol
dc.date.accessioned2021-08-24T09:11:46Z
dc.date.available2021-08-24T09:11:46Z
dc.date.issued2018
dc.identifier.urihttp://hdl.handle.net/11089/38825
dc.description.abstractIn the paper a computational study of the electrocaloric efect is presented for a cubic nanocluster consisting of 8 sites. The system of interest is described by means of an extended Hubbard model in external electric feld at half flling of the energy levels. The thermodynamic description is obtained within canonical ensemble formalism on the basis of exact numerical diagonalization of the system Hamiltonian. In particular, the entropy and the specifc heat are determined as a function of temperature and external electric feld. The electrocaloric efect is described quantitatively by isothermal entropy change. The behaviour of this quantity is thoroughly analysed as a function of extended Hubbard model parameters, temperature and electric feld variation magnitude. The existence of direct and inverse electrocaloric efect is predicted for some range of model parameters. A high sensitivity to Hubbard model parameters is shown, what paves the way towards controlling and tuning the efect. A non-linear, quadratic dependence of isothermal entropy change on electric feld variation magnitude is demonstrated. The potential for applications of electrocaloric efect in strongly correlated nanoclusters is shown.pl_PL
dc.language.isoenpl_PL
dc.publisherSpringer Naturepl_PL
dc.relation.ispartofseriesScientific Reports;8
dc.rightsUznanie autorstwa 4.0 Międzynarodowe*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectelectrocaloric efectpl_PL
dc.subjectcubic Hubbard nanoclusterspl_PL
dc.titleElectrocaloric effect in cubic Hubbard nanoclusterspl_PL
dc.typeArticlepl_PL
dc.page.number1-10pl_PL
dc.contributor.authorAffiliationDepartment of Solid State Physics, Faculty of Physics and Applied Informatics, University of Łódź, ulica Pomorska 149/153, PL90-236, Łódź, Polandpl_PL
dc.identifier.eissn2045-2322
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dc.identifier.doidoi.org/10.1038/s41598-018-23443-x
dc.disciplinenauki fizycznepl_PL


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