Yi-Zhuang You, Zhu Chen, Xiao-Qi Sun, Hui Zhai
In this letter we consider spinless bosons in Kagome lattice with nearest-neighbor hopping and on-site interaction, and the sign of hopping is inverted by insetting a {\pi} flux in each triangle of Kagome lattice so that the lowest single particle band is perfectly flat. We show that in the high density limit, despite of the infinite degenerate of the single particle ground state, interaction will select out the Bloch state at the K point of Brillouin zone for boson condensation at the lowest temperature. As temperature increases, we show that the single boson superfluid order can be easily destroyed, while an exotic triple-boson paired superfluid order will remain. This trion superfluid exist in a broad temperature window until the temperature is increased to the same order of hopping and then the system turns into normal phases. Finally we show that time-of-flight measurement of momentum distribution can be used to distinguish these three phases.
View original:
http://arxiv.org/abs/1207.4795
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