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- W2001125122 abstract "The dynamical mean field theory (DMFT), which is successful in the study of strongly correlated fermions, was recently extended to boson systems [Phys. Rev. B {textbf 77}, 235106 (2008)]. In this paper, we employ the bosonic DMFT to study the Bose-Hubbard model which describes on-site interacting bosons in a lattice. Using exact diagonalization as the impurity solver, we get the DMFT solutions for the Green's function, the occupation density, as well as the condensate fraction on a Bethe lattice. Various phases are identified: the Mott insulator, the Bose-Einstein condensed (BEC) phase, and the normal phase. At finite temperatures, we obtain the crossover between the Mott-like regime and the normal phase, as well as the BEC-to-normal phase transition. Phase diagrams on the $mu/U-tilde{t}/U$ plane and on the $T/U-tilde{t}/U$ plane are produced ($tilde{t}$ is the scaled hopping amplitude). We compare our results with the previous ones, and discuss the implication of these results to experiments." @default.
- W2001125122 created "2016-06-24" @default.
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- W2001125122 date "2009-12-11" @default.
- W2001125122 modified "2023-10-17" @default.
- W2001125122 title "Dynamical mean-field theory for the Bose-Hubbard model" @default.
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- W2001125122 doi "https://doi.org/10.1103/physrevb.80.245110" @default.
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