JILA, University of Colorado, Boulder, Colorado 80309-0440, USA.
Phys Rev Lett. 2011 Nov 11;107(20):200402. doi: 10.1103/PhysRevLett.107.200402.
We explore the properties of weakly bound bosonic states in the strongly interacting regime. Combining a correlated-Gaussian basis set expansion with a complex-scaling method, we extract the energies and structural properties of bosonic cluster states with N ≤ 6 for different two-body potentials. The identification of five- and six-body resonances attached to the first-excited-Efimov trimer provides strong support to the premise of Efimov universality in bosonic systems. Our study also reveals a rich structure of bosonic cluster states. Besides the lowest cluster states that behave as bosonic droplets, we identify cluster states weakly bound to one or two atoms forming effective cluster-atom dimers and cluster-atom-atom "trimers." The experimental signatures of these cluster states are discussed.
我们探索了强相互作用 regime 下弱束缚玻色态的性质。通过结合相关高斯基集展开和复标度方法，我们提取了 N ≤ 6 的不同双体势下玻色子团簇态的能量和结构性质。与第一激发 Efimov 三聚体相关的五体和六体共振的识别为玻色子系统中 Efimov 普遍性的前提提供了强有力的支持。我们的研究还揭示了玻色子团簇态的丰富结构。除了表现为玻色子液滴的最低团簇态外，我们还识别出与一个或两个原子弱束缚的团簇态，形成有效的团簇-原子二聚体和团簇-原子-原子“三聚体”。讨论了这些团簇态的实验特征。
