气候变化领域集成服务门户(CCPortal): Superdiffusion of quantized vortices uncovering scaling laws in quantum turbulence

CCPortal

DOI	10.1073/pnas.2021957118
	Superdiffusion of quantized vortices uncovering scaling laws in quantum turbulence
	Tang Y.; Bao S.; Guo W.
发表日期	2021
ISSN	00278424
卷号	118 期号:6
英文摘要	Generic scaling laws, such as Kolmogorov's 5/3 law, are milestone achievements of turbulence research in classical fluids. For quantum fluids such as atomic Bose-Einstein condensates, superfluid helium, and superfluid neutron stars, turbulence can also exist in the presence of a chaotic tangle of evolving quantized vortex lines. However, due to the lack of suitable experimental tools to directly probe the vortex-tangle motion, so far little is known about possible scaling laws that characterize the velocity correlations and trajectory statistics of the vortices in quantum-fluid turbulence, i.e., quantum turbulence (QT). Acquiring such knowledge could greatly benefit the development of advanced statistical models of QT. Here we report an experiment where a tangle of vortices in superfluid 4He are decorated with solidified deuterium tracer particles. Under experimental conditions where these tracers follow the motion of the vortices, we observed an apparent superdiffusion of the vortices. Our analysis shows that this superdiffusion is not due to Lévy flights, i.e., long-distance hops that are known to be responsible for superdiffusion of random walkers. Instead, a previously unknown power-law scaling of the vortex-velocity temporal correlation is uncovered as the cause. This finding may motivate future research on hidden scaling laws in QT. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Particle tracking velocimetry; Quantum turbulence; Scaling laws; Superdiffusion; Superfluid
语种	英语
scopus关键词	deuterium; Article; controlled study; diffusion; entropy; experimental study; friction; particle image velocimetry; priority journal; quantum chemistry; scale up; turbulent flow; vapor pressure; velocity; vortex motion
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/180702
作者单位	Cryogenics Laboratory, National High Magnetic Field Laboratory, Tallahassee, FL 32310, United States; Mechanical Engineering Department, Florida State University, Tallahassee, FL 32310, United States
推荐引用方式 GB/T 7714	Tang Y.,Bao S.,Guo W.. Superdiffusion of quantized vortices uncovering scaling laws in quantum turbulence[J],2021,118(6).
APA	Tang Y.,Bao S.,&Guo W..(2021).Superdiffusion of quantized vortices uncovering scaling laws in quantum turbulence.Proceedings of the National Academy of Sciences of the United States of America,118(6).
MLA	Tang Y.,et al."Superdiffusion of quantized vortices uncovering scaling laws in quantum turbulence".Proceedings of the National Academy of Sciences of the United States of America 118.6(2021).