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arXiv 1206.7066cond-mat.quant-gas
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弱相互作用玻色气体中的朗道临界速度

Landau critical velocity in weakly interacting Bose gases

Gordon Baym, C. J. Pethick

摘要:

当均匀玻色气体以大于朗道临界速度v_c的速度流动时,不一定会破坏超流性,而只会导致超流质量密度ρ_s的减小。本文分析了弱相互作用玻色气体在有限范围内的粒子间相互作用导致准粒子动量非零时的朗道临界速度,明确地构造了流体流动速度大于v_c时的(非均匀)凝聚体,并计算了伴随的ρ_s的减小。我们简要地评论了物理学与超流体中其他问题的关系,例如,孤子和玻色-爱因斯坦凝聚体中的涡旋,以及超导体中的临界电流。

英文摘要:

The flow of a uniform Bose gas at speeds greater than the Landau critical velocity, v_c, does not necessarily destroy superfluidity, but rather need only lead to a decrease of the superfluid mass density, ρ_s. Analyzing a weakly interacting Bose gas with a finite range interparticle interaction that leads to a Landau critical velocity at non-zero quasiparticle momentum, we explicitly construct the (non-uniform) condensate for fluid flow faster than v_c and calculate the accompanying decrease in ρ_s. We briefly comment on the relation of the physics to other problems in superfluids, e.g., solitons, and vortices in Bose-Einstein condensates, and critical currents in superconductors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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