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dc.contributor.authorGallemí, A.
dc.contributor.authorGuilleumas, M.
dc.contributor.authorMartorell, J.
dc.contributor.authorMayol, R.
dc.contributor.authorPolls, A.
dc.contributor.authorJuliá-Díaz, Bruno
dc.contributor.otherUniversitat Politècnica de Catalunya. Institut de Ciències Fotòniques
dc.date.accessioned2015-11-05T15:00:15Z
dc.date.available2015-11-05T15:00:15Z
dc.date.issued2015-07-15
dc.identifier.issn1367-2630
dc.identifier.urihttp://hdl.handle.net/2117/78833
dc.description.abstractWe consider a Bose–Hubbard (BH) trimer, i.e. an ultracold Bose gas populating three quantum states. The latter can be either different sites of a triple-well potential or three internal states of the atoms. The bosons can tunnel between different states with variable tunnelling strength between two of them. This will allow us to study; (i) different geometrical configurations, i.e. from a closed triangle to three aligned wells and (ii) a triangular configuration with a π-phase, i.e. by setting one of the tunnellings negative. By solving the corresponding three-site BH Hamiltonian we obtain the ground state of the system as a function of the trap topology. We characterize the different ground states by means of the coherence and entanglement properties. For small repulsive interactions, fragmented condensates are found for the π-phase case. These are found to be robust against small variations of the tunnelling in the small interaction regime. A low-energy effective many-body Hamiltonian restricted to the degenerate manifold provides a compelling description of the π-phase degeneration and explains the low-energy spectrum as excitations of discrete semifluxon states.
dc.format.extent16 p.
dc.language.isoeng
dc.publisherIOP
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subjectÀrees temàtiques de la UPC::Física
dc.subject.lcshQuantum optics
dc.subject.otherCondensation
dc.titleFragmented condensation in Bose–Hubbard trimers with tunable tunnelling
dc.typeArticle
dc.subject.lemacÒptica quàntica
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttp://iopscience.iop.org/article/10.1088/1367-2630/17/7/073014/meta
dc.rights.accessOpen Access
dc.description.versionPostprint (published version)
dc.relation.projectidinfo:eu-repo/grantAgreement/ES/6PN/FIS2011-28617-C02-01
local.citation.publicationNameFragmented condensation in Bose–Hubbard trimers with tunable tunnelling
local.citation.volume17
local.citation.number073014
local.personalitzacitaciotrue


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Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain