Ultraquantum turbulence in a quenched homogeneous Bose gas
Ultraquantum turbulence in a quenched homogeneous Bose gas
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淬火均质玻色气体中的超量子湍流
DOI：
10.1103/physreva.94.053632
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发表时间：
2016
影响因子：
2.9
通讯作者：
C. Barenghi
中科院分区：
文献类型：
--
作者：
G. Stagg;N. Parker;C. Barenghi
本文用经典场方法数值研究了玻色气体在高度非平衡初始条件下演化过程中产生的超流涡旋湍流纠缠的特性和衰减。通过分析涡线密度，能谱和速度相关函数，我们确定，从这种有效的热淬火造成的湍流缺乏相干结构和Kolmogorov标度，这些属性是典型的普通经典流体和超流氦时，由网格或螺旋桨驱动。相反，热淬火湍流具有类似于随机流的特性，更类似于另一种在超流氦中观察到的称为超量子湍流的湍流状态。
Using the classical field method, we study numerically the characteristics and decay of the turbulent tangle of superfluid vortices which is created in the evolution of a Bose gas from highly nonequilibrium initial conditions. By analysing the vortex line density, the energy spectrum and the velocity correlation function, we determine that the turbulence resulting from this effective thermal quench lacks the coherent structures and the Kolmogorov scaling; these properties are typical of both ordinary classical fluids and of superfluid helium when driven by grids or propellers. Instead, thermal quench turbulence has properties akin to a random flow, more similar to another turbulent regime called ultra-quantum turbulence which has been observed in superfluid helium.