论文标题
弱相互作用3D玻色气体状态的规范方程的测量
Measurement of the Canonical Equation of State of a Weakly Interacting 3D Bose Gas
论文作者
论文摘要
使用适用于谐波的bose气体的多图像重建方法，我们确定局部密度近似内整个临界过渡点的均匀物质状态方程。我们的实验结果提供了对压力作为特定体积的函数的规范描述，强调了与相互作用引起的理想玻色气体行为的显着偏差。他们还为非单调行为提供了明确的证据，其温度是化学势的温度，这是超流量的结果。将测得的热力学量与可用于相互作用的玻色气体可用的平均场预测进行了比较。还讨论了临界点附近局部密度近似的适用性限制，重点是等温可压缩性的行为。
Using a multiple-image reconstruction method applied to a harmonically trapped Bose gas, we determine the equation of state of uniform matter across the critical transition point, within the local density approximation. Our experimental results provide the canonical description of pressure as a function of the specific volume, emphasizing the dramatic deviations from the ideal Bose gas behavior caused by interactions. They also provide clear evidence for the non-monotonic behavior with temperature of the chemical potential, which is a consequence of superfluidity. The measured thermodynamic quantities are compared to mean-field predictions available for the interacting Bose gas. The limits of applicability of the local density approximation near the critical point are also discussed, focusing on the behavior of the isothermal compressibility.
