Extended Bose-Hubbard models with ultracold magnetic atoms
Extended Bose-Hubbard models with ultracold magnetic atoms
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DOI：
10.1126/science.aac9812
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发表时间：
2016-04-08
期刊：
影响因子：
56.9
通讯作者：
Ferlaino, F.
中科院分区：
文献类型：
--
作者：
Baier, S.;Mark, M. J.;Ferlaino, F.
哈伯德模型是我们理解强关联材料的基础。虽然它的标准形式只包括相同晶格位置上粒子之间的相互作用，但将其扩展到包含长程相互作用，预计将深刻改变系统的量子行为。我们实现了三维光学晶格中强磁性铒原子超冷气体的扩展玻色-哈伯德模型。通过控制原子偶极的取向，揭示了现场相互作用和跳跃动力学的各向异性特征及其对超流到Mott绝缘体量子相变的影响。此外，我们观察到最近邻相互作用，偶极相互作用的长程性质的真正后果。我们的研究结果为今后奇异多体量子相位的研究奠定了基础。
The Hubbard model underlies our understanding of strongly correlated materials. Whereas its standard form only comprises interactions between particles at the same lattice site, extending it to encompass long-range interactions is predicted to profoundly alter the quantum behavior of the system. We realize the extended Bose-Hubbard model for an ultracold gas of strongly magnetic erbium atoms in a three-dimensional optical lattice. Controlling the orientation of the atomic dipoles, we reveal the anisotropic character of the onsite interaction and hopping dynamics and their influence on the superfluid-to-Mott insulator quantum phase transition. Moreover, we observe nearest-neighbor interactions, a genuine consequence of the long-range nature of dipolar interactions. Our results lay the groundwork for future studies of exotic many-body quantum phases.