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Correlated Phases of Bosons in the Flat Lowest Band of the Dice Lattice

By Gunnar Möller and N R Cooper


We study correlated phases occurring in the flat lowest band of the dice lattice model at flux density one half. We discuss how to realize the\ud dice lattice model, also referred to as the $\mathcal{T}_3$ lattice, in cold atomic gases. We construct the projection of the model to the lowest\ud dice band, which yields a Hubbard-Hamiltonian with interaction-assisted hopping processes. We solve this model for bosons in two limits. In the\ud limit of large density, we use Gross-Pitaevskii mean-field theory to reveal time-reversal symmetry breaking vortex lattice phases. At low density,\ud we use exact diagonalization to identify three stable phases at fractional filling factors $\nu$ of the lowest band, including a \ud classical crystal at $\nu=1/3$, a supersolid state at $\nu=1/2$ and a Mott insulator at $\nu=1$

Topics: 11000/11
Publisher: American Physical Society
Year: 2012
OAI identifier:

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