Engels P, Atherton C, Hoefer M A
Washington State University, Department of Physics and Astronomy, Pullman, Washington 99164, USA.
Phys Rev Lett. 2007 Mar 2;98(9):095301. doi: 10.1103/PhysRevLett.98.095301. Epub 2007 Feb 26.
Faraday waves in a cigar-shaped Bose-Einstein condensate are created. It is shown that periodically modulating the transverse confinement, and thus the nonlinear interactions in the BEC, excites small amplitude longitudinal oscillations through a parametric resonance. It is also demonstrated that even without the presence of a continuous drive, an initial transverse breathing mode excitation of the condensate leads to spontaneous pattern formation in the longitudinal direction. Finally, the effects of strongly driving the transverse breathing mode with large amplitude are investigated. In this case, impact-oscillator behavior and intriguing nonlinear dynamics, including the gradual emergence of multiple longitudinal modes, are observed.
在雪茄形玻色 - 爱因斯坦凝聚体中产生了法拉第波。结果表明，通过周期性调制横向约束，进而调制玻色 - 爱因斯坦凝聚体中的非线性相互作用，会通过参量共振激发小振幅纵向振荡。还证明了即使没有连续驱动，凝聚体的初始横向呼吸模式激发也会导致纵向方向上的自发图案形成。最后，研究了用大振幅强烈驱动横向呼吸模式的影响。在这种情况下，观察到了冲击振荡器行为和有趣的非线性动力学，包括多个纵向模式的逐渐出现。
