Fractional-filling Mott domains in two dimensional optical superlattices
arXiv:cond-mat/0505655 · doi:10.1103/PhysRevA.72.031602
Abstract
Ultracold bosons in optical superlattices are expected to exhibit fractional-filling insulating phases for sufficiently large repulsive interactions. On strictly 1D systems, the exact mapping between hard-core bosons and free spinless fermions shows that any periodic modulation in the lattice parameters causes the presence of fractional-filling insulator domains. Here, we focus on two recently proposed realistic 2D structures where such mapping does not hold, i.e. the two-leg ladder and the trimerized kagome' lattice. Based on a cell strong-coupling perturbation technique, we provide quantitatively satisfactory phase diagrams for these structures, and give estimates for the occurrence of the fractional-filling insulator domains in terms of the inter-cell/intra-cell hopping amplitude ratio.
4 pages, 3 figures
References in corpus (6)
- Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
- Tuning the scattering length with an optically induced Feshbach resonance
- Implementation of Spin Hamiltonians in Optical Lattices
- Phase Diagram for Ultracold Bosons in Optical Lattices and Superlattices
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Cited by in corpus (8)
- Cold Bosons in Optical Lattices
- The quasi-periodic Bose-Hubbard model and localization in one-dimensional cold atomic gases
- Extended Bose Hubbard model of interacting bosonic atoms in optical lattices: from superfluidity to density waves
- Quantum phases of bosons in double-well optical lattices
- Hanbury Brown-Twiss Interferometry for Fractional and Integer Mott Phases
- Incompressible states of a two-component Fermi gas in a double-well optical lattice
- Effective tight-binding models in optical moiré potentials
- Ground-state phase diagram of two-component interacting bosons on a two-leg ladder