Journal
SCIENCE
Volume 331, Issue 6013, Pages 58-61Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1195219
Keywords
-
Categories
Funding
- Direct For Mathematical & Physical Scien
- Division Of Physics [0751177] Funding Source: National Science Foundation
Ask authors/readers for more resources
A Fermi gas of atoms with resonant interactions is predicted to obey universal hydrodynamics, in which the shear viscosity and other transport coefficients are universal functions of the density and temperature. At low temperatures, the viscosity has a universal quantum scale (h) over bar n, where n is the density and (h) over bar is Planck's constant h divided by 2 pi, whereas at high temperatures the natural scale is p(T)(3)/(h) over bar (2), where p(T) is the thermal momentum. We used breathing mode damping to measure the shear viscosity at low temperature. At high temperature T, we used anisotropic expansion of the cloud to find the viscosity, which exhibits precise T-3/2 scaling. In both experiments, universal hydrodynamic equations including friction and heating were used to extract the viscosity. We estimate the ratio of the shear viscosity to the entropy density and compare it with that of a perfect fluid.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available