Pairing and density-wave phases in Boson-Fermion mixtures at fixed filling

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dc.creatorKlironomos, F. D.
dc.creatorTsai, S. -W.
dc.date2007-02-27
dc.date.accessioned2026-07-07T08:39:18Z
dc.date.available2026-07-07T08:39:18Z
dc.descriptionWe study a mixture of fermionic and bosonic cold atoms on a two-dimensional optical lattice, where the fermions are prepared in two hyperfine (isospin) states and the bosons have Bose-Einstein condensed (BEC). The coupling between the fermionic atoms and the bosonic fluctuations of the BEC has similarities with the electron-phonon coupling in crystals. We study the phase diagram for this system at fixed fermion density of one per site (half-filling). We find that tuning of the lattice parameters and interaction strengths (for fermion-fermion, fermion-boson and boson-boson interactions) drives the system to undergo antiferromagnetic ordering, s-wave and d-wave pairing superconductivity or a charge density wave phase. We use functional renormalization group analysis where retardation effects are fully taken into account by keeping the frequency dependence of the interaction vertices and self-energies. We calculate response functions and also provide estimates of the energy gap associated with the dominant order, and how it depends on different parameters of the problem.
dc.description5 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0702660
dc.identifierhttp://arxiv.org/abs/cond-mat/0702660
dc.identifierPhys. Rev. Lett. 99, 100401 (2007)
dc.identifierdoi:10.1103/PhysRevLett.99.100401
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/141027
dc.subjectSuperconductivity
dc.titlePairing and density-wave phases in Boson-Fermion mixtures at fixed filling
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