Spatial coherence of a strongly interacting Bose gas in the trimerized kagome lattice
Spatial coherence of a strongly interacting Bose gas in the trimerized kagome lattice
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DOI：
10.1103/physreva.101.011601
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发表时间：
2020-01-29
影响因子：
2.9
通讯作者：
Stamper-Kurn, Dan M.
中科院分区：
文献类型：
--
作者：
Barter, Thomas H.;Leung, Tsz-Him;Stamper-Kurn, Dan M.
我们利用由两种颜色的光以2：1波长比产生的三角形晶格叠加形成的光学超晶格，产生了用于超冷原子的三聚化Kagome晶格。通过调节每个晶格的深度，可以调节强的中间体(J)和弱的中间体(J‘)的隧穿能，以及就位相互作用能U。用物质波衍射法区分了两种不同的三聚模式。我们描述了该晶格中强相互作用玻色气体的相干性，在大U/J‘极限下观察到了持久的最近邻空间相干性，并且这种相干性表现出强耦合键和弱耦合键之间的不对称性。
We produce a trimerized kagome lattice for ultracold atoms using an optical superlattice formed by overlaying triangular lattices generated with two colors of light at a 2:1 wavelength ratio. Adjusting the depth of each lattice tunes the strong intratrimer (J) and weak intertrimer (J') tunneling energies, and also the on-site interaction energy U. Two different trimerization patterns are distinguished using matter-wave diffraction. We characterize the coherence of a strongly interacting Bose gas in this lattice, observing persistent nearest-neighbor spatial coherence in the large U/J' limit, and that such coherence displays asymmetry between the strongly and the weakly coupled bonds.