Superfluid to Mott-insulator transition in Bose-Hubbard models
Superfluid to Mott-insulator transition in Bose-Hubbard models
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DOI：
10.1103/physrevlett.99.056402
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发表时间：
2007-08-03
影响因子：
8.6
通讯作者：
Sorella, Sandro
中科院分区：
文献类型：
--
作者：
Capello, Manuela;Becca, Federico;Sorella, Sandro
我们通过最近提出的变分波函数研究了一维、二维和三维立方晶格中 Bose-Hubbard 模型中的超流体-绝缘体转变。在一个维度上，变分结果与交互驱动的莫特转变的预期 Berezinskii-Kosterlitz-Thouless 情景一致。在二维和三维中，我们发现证据表明，在整个跃迁过程中，大部分光谱权重集中在高能量处，这表明存在预先形成的莫特-哈伯德边带。这一结果与 Stoferle 等人的实验数据一致。 [物理。莱特牧师。 92, 130403 (2004)]。
We study the superfluid-insulator transition in Bose-Hubbard models in one-, two-, and three-dimensional cubic lattices by means of a recently proposed variational wave function. In one dimension, the variational results agree with the expected Berezinskii-Kosterlitz-Thouless scenario of the interaction-driven Mott transition. In two and three dimensions, we find evidence that, across the transition, most of the spectral weight is concentrated at high energies, suggestive of preformed Mott-Hubbard sidebands. This result is compatible with the experimental data by Stoferle et al. [Phys. Rev. Lett. 92, 130403 (2004)].