Joint Quantum Centre Durham-Newcastle, School of Mathematics and Statistics, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom.
Phys Rev Lett. 2018 Oct 26;121(17):174501. doi: 10.1103/PhysRevLett.121.174501.
We study the elementary characteristics of turbulence in a quantum ferrofluid through the context of a dipolar Bose gas condensing from a highly nonequilibrium thermal state. Our simulations reveal that the dipolar interactions drive the emergence of polarized turbulence and density corrugations. The superfluid vortex lines and density fluctuations adopt a columnar or stratified configuration, depending on the sign of the dipolar interactions, with the vortices tending to form in the low-density regions to minimize kinetic energy. When the interactions are dominantly dipolar, the decay of the vortex line length is enhanced, closely following a t^{-3/2} behavior. This system poses exciting prospects for realizing stratified quantum turbulence and new levels of generating and controlling turbulence using magnetic fields.
我们通过从高度非平衡热态凝聚的偶极玻色气体的角度研究了量子铁磁流体中的湍流基本特性。我们的模拟表明，偶极相互作用驱动了极化湍流和密度波纹的出现。超流涡旋线和密度涨落呈现柱状或层状结构，这取决于偶极相互作用的符号，由于最小化动能，涡旋倾向于在低密度区域形成。当相互作用主要是偶极子时，涡旋线长度的衰减会增强，几乎遵循 t^{-3/2}的行为。这个系统为实现分层量子湍流以及利用磁场产生和控制湍流的新水平提供了令人兴奋的前景。
