Maragò O, Hechenblaikner G, Hodby E, Foot C
Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU, United Kingdom.
Phys Rev Lett. 2001 Apr 30;86(18):3938-41. doi: 10.1103/PhysRevLett.86.3938.
We have studied the properties of the scissors mode of a trapped Bose-Einstein condensate of 87Rb atoms at finite temperature. We measured a significant shift in the frequency of the mode below the hydrodynamic limit and a strong dependence of the damping rate as the temperature increased. We compared our damping rate results to recent theoretical calculations for other observed collective modes, finding a fair agreement. From the frequency measurements we deduce the moment of inertia of the gas and show that it is quenched below the transition point, because of the superfluid nature of the condensed gas.
我们研究了有限温度下87Rb原子捕获的玻色-爱因斯坦凝聚体剪刀模的性质。我们测量到该模式频率在低于流体动力学极限时发生了显著偏移，并且随着温度升高，阻尼率强烈依赖于温度。我们将我们的阻尼率结果与其他观测到的集体模式的最新理论计算进行了比较，发现吻合度较好。通过频率测量，我们推导出了气体的转动惯量，并表明由于凝聚气体的超流性质，它在转变点以下被猝灭。
