一个玻色-爱因斯坦凝聚体超流临界速度值的修正

超流最关键的物理量就是临界速度,美国MIT(麻省理工学院)实验组用激光来回扫描凝聚体的方法测出BEC超流体的临界速度,但是与Bogolyubov的理论得出来的值相比小得多,P.O.Fedichev考虑凝聚体处在外势中和各相异性的特点,理论计算的结果与MIT(麻省理工学院)实验组测量的实验值接近,但还是有一定的差距。考虑到非凝聚粒子的影响,发现MIT组测得的实验值并不是临界速度,而是准粒子的速度,实际临界速度比测得的速度要大。估算了准粒子的有效质量,并用碰撞模型对MIT组测得的实验值进行了修正。Jun Suzuki考虑了非凝聚态粒子的影响,计算出的临界速度的理论值与修正后的MIT组的实验结果相符。

A modification of superfluity's critical velocity for the Bose-Einstein condensates

The key physical quantity of superfluity is the critical velocity,MIT group test the critical velocity of condensate by moving a laser beam through the condensate at different velocities,but its data is much small than the data of Bogolyubov theory,P.O.Fedichev considered the condition that condensates are in the external potential and anisotropic,and gets a closer theory data,but it is still bigger than the data tested by MIT group.In this paper,we considered the effect made by the noncondensates,and found...