Countersuperflow instability in miscible two-component Bose-Einstein condensates

被引:47
作者
Ishino, Shungo [1 ]
Tsubota, Makoto [1 ]
Takeuchi, Hiromitsu [2 ]
机构
[1] Osaka City Univ, Dept Phys, Sumiyoshi Ku, Osaka 5588585, Japan
[2] Hiroshima Univ, Grad Sch Integrated Arts & Sci, Higashihiroshima 7398521, Japan
来源
PHYSICAL REVIEW A | 2011年 / 83卷 / 06期
关键词
D O I
10.1103/PhysRevA.83.063602
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We study theoretically the instability of countersuperflow, i.e., two counterpropagating miscible superflows, in uniform two-component Bose-Einstein condensates. Countersuperflow instability causes mutual friction between the superfluids, causing a momentum exchange between the two condensates, when the relative velocity of the counterflow exceeds a critical value. The momentum exchange leads to nucleation of vortex rings from characteristic density patterns due to the nonlinear development of the instability. Expansion of the vortex rings drastically accelerates the momentum exchange, leading to a highly nonlinear regime caused by intervortex interaction and vortex reconnection between the rings. For a sufficiently large interaction between the two components, rapid expansion of the vortex rings causes isotropic turbulence and the global relative motion of the two condensates relaxes. The maximum vortex line density in the turbulence is proportional to the square of the relative velocity.
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页数:8
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