Analytical Mean-Field Approach to the Phase Diagram of Ultracold Bosons in Optical Superlattices
Anno: 2005
Autori: Buonsante P., Penna V., Vezzani A.
Affiliazione autori: [1,2] Dipartimento di Fisica and INFM, Politecnico di Torino
[3] Dipartimento di Fisica and INFM, Università degli Studi di Parma
Abstract: We report a multiple-site mean-field analysis of the zero-temperature phase diagram for ultracold bosons in realistic optical superlattices. The system of interacting bosons is described by a Bose–Hubbard model whose site-dependent parameters reflect the nontrivial periodicity of the optical superlattice. An analytic approach is formulated based on an analysis of the stability of a fixed point of the map defined by the self-con- sistency condition inherent in the mean-field approximation. The experimentally relevant case of the two-period one-dimensional superlattice is briefly discussed. In particular, it is shown that, for a special choice of the super- lattice parameters, the half-filling insulator domain features an unusual loophole shape that the single-site mean-field approach fails to capture.
Giornale/Rivista: LASER PHYSICS
Volume: 15 (2) Da Pagina: 361 A: 365
Parole chiavi: ultracold atoms; optical lattices; superlattices; quantum phases; Citazioni: 29dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-05-18Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui
