Supersonic flow of a Bose-Einstein condensate past an oscillating attractive-repulsive obstacle

被引：9
作者：
Khamis, E. G. [1 ,2 ]
Gammal, A. [1 ]
机构：
[1] Univ Sao Paulo, Inst Fis, BR-05508090 Sao Paulo, Brazil
[2] Univ Loughborough, Dept Math Sci, Loughborough LE11 3TU, Leics, England
来源：
PHYSICAL REVIEW A | 2013年 / 87卷 / 04期
基金：
巴西圣保罗研究基金会;
关键词：
SOLITONS; DISSIPATION; MODEL;
D O I：
10.1103/PhysRevA.87.045601
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We investigate by numerical simulations the pattern formation after an oscillating attractive-repulsive obstacle inserted into the flow of a Bose-Einstein condensate. For slow oscillations we observe a complex emission of vortex dipoles. For moderate oscillations organized lined up vortex dipoles are emitted. For high frequencies no dipoles are observed but only lined up dark fragments. The results shows that the drag force turns negative for sufficiently high frequency. We also successfully model the ship waves in front of the obstacle. In the limit of very fast oscillations all the excitations of the system tend to vanish. DOI: 10.1103/PhysRevA.87.045601
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页数：5
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