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• W1549724811 abstract "Recent experiments revealed the importance of higher-band effects for the Mott insulator (MI) -- superfluid transition (SF) of ultracold bosonic atoms or mixtures of bosons and fermions in deep optical lattices [Best emph{et al.}, PRL textbf{102}, 030408 (2009); Will emph{et al.}, Nature textbf{465}, 197 (2010)]. In the present work, we derive an effective lowest-band Hamiltonian in 3D that generalizes the standard Bose-Fermi Hubbard model taking these effects as well as nonlinear corrections of the tunneling amplitudes mediated by interspecies interactions into account. It is shown that a correct description of the lattice states in terms of the bare-lattice Wannier functions rather than approximations such as harmonic oscillator states is essential. In contrast to self-consistent approaches based on effective Wannier functions our approach provides a quantitative explanation of the observed reduction of the superfluid phase for repulsive interspecies interactions." @default.
• W1549724811 created "2016-06-24" @default.
• W1549724811 creator A5062388329 @default.
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• W1549724811 date "2011-06-27" @default.
• W1549724811 modified "2023-10-01" @default.
• W1549724811 title "Multiband and nonlinear hopping corrections to the three-dimensional Bose-Fermi-Hubbard model" @default.
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• W1549724811 doi "https://doi.org/10.1103/physreva.83.063630" @default.
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