Suppression and enhancement of impurity scattering in a Bose-Einstein condensate

被引：209

作者：

Chikkatur, AP

Görlitz, A

Stamper-Kurn, DM

Inouye, S

Gupta, S

Ketterle, W

机构：

[1] MIT, Dept Phys, Cambridge, MA 02139 USA

[2] MIT, Elect Res Lab, Cambridge, MA 02139 USA

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 85卷 / 03期

关键词：

D O I：

10.1103/PhysRevLett.85.483

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Impurity atoms propagating at variable velocities through a trapped Bose-Einstein condensate were produced using a stimulated Raman transition. The redistribution of momentum by collisions between the impurity atoms and the stationary condensate was observed in a time-of-flight analysis. The collisional cross section was dramatically reduced when the impurity velocity was reduced below the condensate speed of sound, in agreement with the Landau criterion for superfluidity. For large numbers of impurity atoms, we observed an enhancement of atomic collisions due to bosonic stimulation. This enhancement is analogous to optical super-radiance.

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页码：483 / 486

页数：4

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