Physics – Condensed Matter – Quantum Gases
Scientific paper
2010-09-09
Physics
Condensed Matter
Quantum Gases
10 pages, 4 figures, submitted to PRA
Scientific paper
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.
Fleischhauer Michael
Mering Alexander
No associations
LandOfFree
Multi-band and nonlinear hopping corrections to the 3D Bose-Fermi Hubbard model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Multi-band and nonlinear hopping corrections to the 3D Bose-Fermi Hubbard model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-band and nonlinear hopping corrections to the 3D Bose-Fermi Hubbard model will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-559152