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arXiv 0908.3260cond-mat.quant-gascond-mat.other
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湍流原子玻色-爱因斯坦凝聚体中的非经典速度统计

Non classical velocity statistics in a turbulent atomic Bose Einstein condensate

Angela White, Nick P. Proukakis, Carlo F. Barenghi

摘要:

在最近的实验中,Paoletti等人(Phys.Rev.Lett. 101,154501,2008)监测了示踪粒子在湍流超流氦中的运动,并推断出速度分量不服从在普通湍流中观察到的高斯统计。受他们实验的启发,我们在原子玻色-爱因斯坦凝聚体中创造了一个小的湍流态,这使我们能够直接计算速度场,我们发现了类似的非经典幂律尾。因此,我们的结果表明,非高斯湍流速度统计描述了量子流体的基本属性。我们还跟踪的热云的存在下的涡旋纠缠的衰减。

英文摘要:

In a recent experiment Paoletti et al (Phys. Rev. Lett. 101, 154501, 2008) monitored the motion of tracer particles in turbulent superfluid helium and inferred that the velocity components do not obey the Gaussian statistics observed in ordinary turbulence. Motivated by their experiment, we create a small turbulent state in an atomic Bose-Einstein condensate, which enables us to compute directly the velocity field, and we find similar non-classical power-law tails. Our result thus suggests that non-Gaussian turbulent velocity statistics describe a fundamental property of quantum fluids. We also track the decay of the vortex tangle in the presence of the thermal cloud.

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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