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.

引用

页数：5

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