Vortex-induced phase-slip dissipation in a toroidal Bose-Einstein condensate flowing through a barrier

被引:54
|
作者
Piazza, F. [1 ,3 ]
Collins, L. A. [2 ]
Smerzi, A. [1 ,3 ]
机构
[1] Univ Trent, Dipartimento Fis, I-38050 Povo, Italy
[2] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA
[3] Univ Trent, CNR, INFM BEC Ctr, I-38050 Povo, Italy
来源
PHYSICAL REVIEW A | 2009年 / 80卷 / 02期
关键词
SUPERFLUID HE-4; TRANSITION;
D O I
10.1103/PhysRevA.80.021601
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We study superfluid dissipation due to phase slips for a Bose-Einstein condensate flowing through a repulsive barrier inside a torus. The barrier is adiabatically raised across the annulus, while the condensate flows with a finite quantized angular momentum. At a critical height, a vortex moves from the inner region and reaches the barrier to eventually circulate around the annulus. At a higher critical height, an antivortex also enters into the torus from the outer region. Both vortex and antivortex decrease the total angular momentum by leaving behind a 2 pi phase slip. When they collide and annihilate or orbit along the same loop, the condensate suffers a global 2 pi phase slip, and the total angular momentum decreases by one quantum. In hydrodynamic regime, the instability sets in when the local superfluid velocity equals the sound speed inside the barrier region.
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页数:4
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