Ott H, Fortágh J, Kraft S, Günther A, Komma D, Zimmermann C
Physikalisches Institut der Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen, Germany.
Phys Rev Lett. 2003 Jul 25;91(4):040402. doi: 10.1103/PhysRevLett.91.040402. Epub 2003 Jul 24.
We have studied the internal and external dynamics of a Bose-Einstein condensate in an anharmonic magnetic waveguide. An oscillating condensate experiences a strong coupling between the center of mass motion and the internal collective modes. Because of the anharmonicity of the magnetic potential, not only the center of mass motion shows harmonic frequency generation, but also the internal dynamics exhibit nonlinear frequency mixing. Thereby, the condensate shows shape oscillations with an extremely large change in the aspect ratio of up to a factor of 10. We describe the data with a theoretical model to high accuracy. For strong excitations we test the experimental data for indications of a chaotic behavior.
我们研究了非简谐磁波导中玻色-爱因斯坦凝聚体的内部和外部动力学。振荡的凝聚体在质心运动和内部集体模式之间经历强耦合。由于磁势的非简谐性，不仅质心运动表现出谐波频率产生，而且内部动力学也呈现非线性频率混合。由此，凝聚体表现出形状振荡，其纵横比变化极大，可达10倍。我们用理论模型高精度地描述了数据。对于强激发，我们测试了实验数据以寻找混沌行为的迹象。
