期刊
NATURE PHYSICS
卷 7, 期 5, 页码 434-440出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS1916
关键词
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资金
- Joachim Herz Stiftung
- Deutsche Forschungsgemeinschaft DFG [FOR801, GRK 1355]
- Spanish MICINN [FIS2008-00784]
- Alexander von Humboldt foundation
- Caixa Manresa
- ERC
- EU
- ICREA Funding Source: Custom
In solid-state materials, the static and dynamic properties as well as the magnetic and electronic characteristics are crucially influenced by the crystal symmetry. Hexagonal structures play a particularly important role and lead to novel physics, such as that of carbon nanotubes or graphene. Here we report on the realization of ultracold atoms in a spin-dependent optical lattice with hexagonal symmetry. We show how the combined effects of the lattice and interactions between atoms lead to a forced antiferromagnetic Neel order when two spin-components localize at different lattice sites. We also demonstrate that the coexistence of two components-one Mott-insulating and the other one superfluid-leads to an interaction-induced modulation of the superfluid density, which is observed spectroscopically. Our studies reveal the vast impact of the interaction-induced modulation on the superfluid-to-Mott-insulator transition. The observations are consistent with theoretical predictions using Gutzwiller mean-field theory.
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