Loss of superfluidity by fermions in the boson Hubbard model on an optical lattice

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dc.creatorLutchyn, Roman M.
dc.creatorTewari, Sumanta
dc.creatorSarma, S. Das
dc.date2008-12-03
dc.date2008-12-15
dc.date.accessioned2026-07-07T13:17:42Z
dc.date.available2026-07-07T13:17:42Z
dc.descriptionThe experimentally observed loss of superfluidity by introducing fermions to the boson Hubbard system on an optical lattice is explained. We show that the virtual transitions of the bosons to the higher Bloch bands, coupled with the contact boson-fermion interactions of either sign, result in an effective increase of the boson on-site repulsion. If this renormalization of the on-site potential is dominant over the fermion screening of the boson interactions, the Mott insulating lobes of the Bose-Hubbard phase diagram will be enhanced for either sign of the boson-fermion interactions. We discuss implications for cold atom experiments where the expansion of the Mott lobes by fermions has been conclusively established.
dc.description4 pages, 1 eps figure, minor changes
dc.identifierhttps://arxiv.org/abs/0812.0815
dc.identifierhttp://arxiv.org/abs/0812.0815
dc.identifierPhys. Rev. A 79, 011606(R) (2009)
dc.identifierdoi:10.1103/PhysRevA.79.011606
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/231196
dc.subjectStrongly Correlated Electrons
dc.subjectQuantum Physics
dc.titleLoss of superfluidity by fermions in the boson Hubbard model on an optical lattice
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