Modulational instabilities in Josephson oscillations of elongated coupled condensates

被引：23

作者：

Bouchoule, I ^{[1
]}

机构：

[1] CNRS, UMR 8501, Inst Opt, Lab Charles Fabry, F-91403 Orsay, France

来源：

EUROPEAN PHYSICAL JOURNAL D | 2005年 / 35卷 / 01期

关键词：

D O I：

10.1140/epjd/e2005-00091-y

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We study the Josephson oscillations of two coupled elongated condensates. Linearized calculations show that the oscillating mode uniform over the length of the condensates (uniform Josephson mode) is unstable: modes of non zero longitudinal momentum grow exponentially. In the limit of strong atom interactions, we give scaling laws for the instability time constant and unstable wave vectors. Beyond the linearized approach, numerical calculations show a damped recurrence behavior: the energy in the Josephson mode presents damped oscillations. Finally, we derive conditions on the confinement of the condensates to prevent instabilities.

引用

页码：147 / 154

页数：8

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