Stability spectroscopy of rotons in a dipolar Bose gas

被引：16
|
作者：
Corson, John P. [1 ,2 ]
Wilson, Ryan M. [3 ,4 ]
Bohn, John L. [1 ,2 ]
机构：
[1] Univ Colorado, NIST, JILA, Boulder, CO 80309 USA
[2] Univ Colorado, Dept Phys, Boulder, CO 80309 USA
[3] Univ Maryland, NIST, JQI, Gaithersburg, MD 20899 USA
[4] Univ Maryland, Dept Phys, Gaithersburg, MD 20899 USA
来源：
PHYSICAL REVIEW A | 2013年 / 87卷 / 05期
基金：
美国国家科学基金会;
关键词：
STATE TRANSFER;
D O I：
10.1103/PhysRevA.87.051605
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We study the stability of a quasi-one-dimensional dipolar Bose-Einstein condensate that is perturbed by a weak lattice potential along its axis. Our numerical simulations demonstrate that systems exhibiting a roton-maxon structure destabilize readily when the lattice wavelength equals either half the roton wavelength or a low roton subharmonic. We apply perturbation theory to the Gross-Pitaevskii and Bogoliubov-de Gennes equations to illustrate the mechanisms behind the instability threshold. The features of our stability diagram may be used as a direct measurement of the roton wavelength for quasi-one-dimensional geometries.
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页数：5
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