Condition for convective instability of dark solitons

被引：18

作者：

Kamchatnov, A. M. ^{[1
]}

Korneev, S. V. ^{[1
]}

机构：

[1] Russian Acad Sci, Inst Spect, Troitsk 142190, Moscow Region, Russia

来源：

PHYSICS LETTERS A | 2011年 / 375卷 / 26期

关键词：

Dark solitons; Snake instability; Convective instability; Bose-Einstein condensate;

D O I：

10.1016/j.physleta.2011.05.036

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Simple derivation of the condition for the transition point from absolute instability of plane dark solitons to their convective instability is suggested. It is shown that unstable wave packet expands with velocity equal to the minimal group velocity of the disturbance waves propagating along a dark soliton. The growth rate of the length of dark solitons generated by the flow of Bose-Einstein condensate past an obstacle is estimated. Analytical theory is confirmed by the results of numerical simulations. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：2577 / 2580

页数：4

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