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Fragmented condensation in Bose–Hubbard trimers with tunable tunnelling
dc.contributor.author | Gallemí, A. |
dc.contributor.author | Guilleumas, M. |
dc.contributor.author | Martorell, J. |
dc.contributor.author | Mayol, R. |
dc.contributor.author | Polls, A. |
dc.contributor.author | Juliá-Díaz, Bruno |
dc.contributor.other | Universitat Politècnica de Catalunya. Institut de Ciències Fotòniques |
dc.date.accessioned | 2015-11-05T15:00:15Z |
dc.date.available | 2015-11-05T15:00:15Z |
dc.date.issued | 2015-07-15 |
dc.identifier.issn | 1367-2630 |
dc.identifier.uri | http://hdl.handle.net/2117/78833 |
dc.description.abstract | We 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.extent | 16 p. |
dc.language.iso | eng |
dc.publisher | IOP |
dc.rights | Attribution-NonCommercial-NoDerivs 3.0 Spain |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
dc.subject | Àrees temàtiques de la UPC::Física |
dc.subject.lcsh | Quantum optics |
dc.subject.other | Condensation |
dc.title | Fragmented condensation in Bose–Hubbard trimers with tunable tunnelling |
dc.type | Article |
dc.subject.lemac | Òptica quàntica |
dc.description.peerreviewed | Peer Reviewed |
dc.relation.publisherversion | http://iopscience.iop.org/article/10.1088/1367-2630/17/7/073014/meta |
dc.rights.access | Open Access |
dc.description.version | Postprint (published version) |
dc.relation.projectid | info:eu-repo/grantAgreement/MICINN//FIS2011-28617-C02-01/ES/RESEARCH TOPICS IN THE STRUCTURE AND DYNAMICS OF ATOMIC, NUCLEAR AND ELECTRONIC SYSTEMS/ |
local.citation.publicationName | Fragmented condensation in Bose–Hubbard trimers with tunable tunnelling |
local.citation.volume | 17 |
local.citation.number | 073014 |
local.personalitzacitacio | true |
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