Role of Interactions in 87Rb-40K Bose-Fermi Mixtures in a 3D Optical Lattice
Role of Interactions in 87Rb-40K Bose-Fermi Mixtures in a 3D Optical Lattice
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DOI：
10.1103/physrevlett.102.030408
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发表时间：
2009-01-23
影响因子：
8.6
通讯作者：
Luehmann, D. -S.
中科院分区：
文献类型：
--
作者：
Best, Th.;Will, S.;Luehmann, D. -S.
我们研究了三维光学晶格势中种间相互作用对玻色子Rb-87和费米子K-40原子简并混合物的影响。使用Feshbach共振，Rb-87-K-40相互作用在宽范围内调谐。通过对Rb-87动量分布的分析，我们发现强排斥和强吸引之间存在明显的不对称性。在后一种情况下，我们观察到一个显着的转变，在超流莫特绝缘体过渡，我们归因于重整化的玻色-哈伯德参数由于自陷。
We investigate the effect of interspecies interaction on a degenerate mixture of bosonic Rb-87 and fermionic K-40 atoms in a three-dimensional optical lattice potential. Using a Feshbach resonance, the Rb-87-K-40 interaction is tuned over a wide range. Through an analysis of the Rb-87 momentum distribution, we find a pronounced asymmetry between strong repulsion and strong attraction. In the latter case, we observe a marked shift in the superfluid to Mott insulator transition, which we attribute to a renormalization of the Bose-Hubbard parameters due to self-trapping.