论文标题
棕褐色的两体接触在平面bose气体的超流体过渡中
Tan's two-body contact across the superfluid transition of a planar Bose gas
论文作者
论文摘要
谭的接触是从其动量分布到其空间两体相关函数的低温气体的许多不同特性的数量。在这里，我们使用Ramsey干涉方法来实验实现两体接触的热力学定义，即在散射长度的小修改中内部能量的变化。我们的测量值是在berezinskii-kosterlitz-无尽的超级流体过渡的$^{87} $ rb原子的均匀的二维bose气体上进行的。它们与强烈退化的流体和正常气体的限制案例中的理论预测息息相关。它们还提供了关键区域中此关键数量的变化，在此过程中需要进一步的理论努力来解释我们的发现。
Tan's contact is a quantity that unifies many different properties of a low-temperature gas with short-range interactions, from its momentum distribution to its spatial two-body correlation function. Here, we use a Ramsey interferometric method to realize experimentally the thermodynamic definition of the two-body contact, i.e. the change of the internal energy in a small modification of the scattering length. Our measurements are performed on a uniform two-dimensional Bose gas of $^{87}$Rb atoms across the Berezinskii-Kosterlitz-Thouless superfluid transition. They connect well to the theoretical predictions in the limiting cases of a strongly degenerate fluid and of a normal gas. They also provide the variation of this key quantity in the critical region, where further theoretical efforts are needed to account for our findings.
