Physics – Quantum Physics
Scientific paper
2009-10-15
J. Phys. B: At. Mol. Opt. Phys. 44 (2011) 115101 (9pp)
Physics
Quantum Physics
9 pages, 14 figures
Scientific paper
10.1088/0953-4075/44/11/115101
Quantum turbulence that exhibits vortex creation, annihilation and interactions is demonstrated as an exact solution of the time-dependent, free-particle Schr\"odinger equation evolved from a smooth random-phased initial condition. Relaxed quantum turbulence in 2D and 3D exhibits universal scaling in the steady-state energy spectrum as k-1 in small scales. Due to the lack of dissipation, no evidence of the Kolmogorov-type forward energy cascade in 3D or the inverse energy cascade in 2D is found, but the rotational and potential flow components do approach equi-partition in the scaling regime. In addition, the 3D vortex line-line correlation exhibits universal behaviour, scaled as \Deltar^-2, where \Deltar is the separation between any two vortex line elements, in fully developed turbulence. We also show that the quantum vortex is not frozen to the matter, nor is the vortex motion induced by other vortices via Biot-Savart's law. Thus, the quantum vortex is actually a nonlinear wave, propagating at a speed very different from a classical vortex.
Chiueh Tzihong
Jian Hung-Yu
Schive Hsi-Yu
Woo Tak-Pong
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