Universal Four-Boson States in Ultracold Molecular Gases: Resonant Effects in Dimer-Dimer Collisions
Universal Four-Boson States in Ultracold Molecular Gases: Resonant Effects in Dimer-Dimer Collisions
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DOI：
10.1103/physrevlett.103.033004
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发表时间：
2009-07-17
影响因子：
8.6
通讯作者：
Greene, Chris H.
中科院分区：
文献类型：
--
作者：
D'Incao, J. P.;von Stecher, J.;Greene, Chris H.
我们研究了宇宙四体物理在超冷二聚体-二聚体碰撞中的表现。我们发现与三体Efimov物理相关的共振特征和二聚体-二聚体的散射长度是普遍相关的。普遍的四玻色子状态的出现使得二聚体-二聚体相互作用的可调性成为可能，从而使未来对具有吸引和排斥相互作用的超冷分子气体的研究成为可能。此外，我们对二聚体和Efimov三聚体之间相互转化的研究表明，B(2)+B(2)->；B(3)+B重排反应可以提供一个有效的三聚体形成机制。我们对该反应的温度依赖性的分析提供了对现有实验数据的解释，并为在超冷气体中重排过程的可能的实验实现提供了曙光。
We study the manifestations of universal four-body physics in ultracold dimer-dimer collisions. We show that resonant features associated with three-body Efimov physics and dimer-dimer scattering lengths are universally related. The emergence of universal four-boson states allows for the tunability of the dimer-dimer interaction, thus enabling the future study of ultracold molecular gases with both attractive and repulsive interactions. Moreover, our study of the interconversion between dimers and Efimov trimers shows that B(2)+B(2)-> B(3)+B rearrangement reactions can provide an efficient trimer formation mechanism. Our analysis of the temperature dependence of this reaction provides an interpretation of the available experimental data and sheds light on the possible experimental realization of rearrangement processes in ultracold gases.