Institut für Experimentalphysik und Zentrum für Quantenphysik, Universität Innsbruck, 6020 Innsbruck, Austria.
Phys Rev Lett. 2011 Dec 2;107(23):230404. doi: 10.1103/PhysRevLett.107.230404.
We investigate local three-body correlations for bosonic particles in three dimensions and one dimension as a function of the interaction strength. The three-body correlation function g(3) is determined by measuring the three-body recombination rate in an ultracold gas of Cs atoms. In three dimensions, we measure the dependence of g(3) on the gas parameter in a BEC, finding good agreement with the theoretical prediction accounting for beyond-mean-field effects. In one dimension, we observe a reduction of g(3) by several orders of magnitude upon increasing interactions from the weakly interacting BEC to the strongly interacting Tonks-Girardeau regime, in good agreement with predictions from the Lieb-Liniger model for all strengths of interaction.
我们研究了三维和一维中玻色子的局域三体相关，作为相互作用强度的函数。三体相关函数 g(3) 通过测量 Cs 原子超冷气体中的三体复合率来确定。在三维中，我们测量了 g(3) 对 BEC 中气体参数的依赖关系，发现与考虑超越平均场效应的理论预测非常吻合。在一维中，我们观察到当相互作用从弱相互作用的 BEC 增加到强相互作用的 Tonks-Girardeau regime 时，g(3) 减少了几个数量级，这与 Lieb-Liniger 模型对所有相互作用强度的预测非常吻合。
