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原文連結
論文資訊
- 類型：已發表論文
- 日期：2013
摘要
We discuss the phase diagram of the Bose-Hubbard (BH) model in the leading-order auxiliary field (LOAF) theory. LOAF is a conserving nonperturbative approximation that treats on equal footing the normal and anomalous density condensates. The mean-field solutions in LOAF correspond to first-order and second-order 相變 solutions with two critical temperatures corresponding to a vanishing Bose-Einstein condensate T-c and a vanishing diatom condensate T-star. The second-order 相變 solution predicts the correct order of the transition in continuum Bose gases. For either solution, the superfluid state is tied to the presence of the diatom condensate related to the anomalous density in the system. In ultracold Bose atomic gases confined on a three-dimensional lattice, the critical temperature T-c exh
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