论文标题
碰撞超级流体玻色气中的声音模式
Sound modes in collisional superfluid Bose gases
论文作者
论文摘要
从理论上讲，我们在$ d $尺寸的较弱相互互动的碰撞bose气体中调查了声音模式。使用Landau的两流体流体动力学并在Bogoliubov理论中工作，我们观察到$ d \ ge 2 $的第一和第二声音模式的杂交。为了建模在弱相互交互的态度以及Berezinskii-kosterlitz-无限过渡温度周围获得的2D中声速的最新测量值，我们得出了对超氟密度的精制计算，并与实验找到了公平的一致性。在1D情况下，目前无法实验结果，我们发现没有杂交，从而触发了未来研究的必要性。我们的分析提供了对$ d $尺寸碰撞弱相互交互的bose气体中声音传播的系统理解。
We theoretically investigate sound modes in a weakly-interacting collisional Bose gas in $D$ dimensions. Using the Landau's two-fluid hydrodynamics and working within the Bogoliubov theory, we observe the hybridization of the first and second sound modes for $D\ge 2$. To model the recent measurements of the sound velocities in 2D, obtained in the weakly-interacting regime and around the Berezinskii-Kosterlitz-Thouless transition temperature, we derive a refined calculation of the superfluid density, finding a fair agreement with the experiment. In the 1D case, for which experimental results are currently unavailable, we find no hybridization, triggering the necessity of future investigations. Our analysis provides a systematic understanding of sound propagation in a collisional weakly-interacting Bose gas in $D$ dimensions.
