Searching for perfect fluids: quantum viscosity in a universal Fermi gas
نویسندگان
چکیده
منابع مشابه
Searching for perfect fluids: quantum viscosity in a universal Fermi gas
We measure the shear viscosity in a two-component Fermi gas of atoms, tuned to a broad s-wave collisional (Feshbach) resonance. At resonance, the atoms strongly interact and exhibit universal behavior, where the equilibrium thermodynamic properties and transport coefficients are universal functions of density n and temperature T . We present a new calibration of the temperature as a function of...
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The system we consider here is a charged fermions gas in the effective mass approximation, and in grand-canonical conditions. We assume that the particles are confined in a three dimensional cubic box Λ with side L ≥ 1, and subjected to a constant magnetic field of intensity B ≥ 0. Define the grand canonical generalized susceptibilities χL , N ≥ 1, as successive partial derivatives with respect...
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We measure the static shear viscosity η in a two-component Fermi gas near a broad collisional (Feshbach) resonance, as a function of interaction strength and energy. We find that η has both a quadratic and a linear dependence on the interaction strength 1/(k(FI)a), where a is the s-wave scattering length and k(FI) is the Fermi wave vector for an ideal gas at the trap center. For energies above ...
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Thermodynamic properties of matter generally depend on the details of interactions between its constituent parts. However, in a unitary Fermi gas where the scattering length diverges, thermodynamics is determined through universal functions that depend only on the particle density and temperature. By using only the general form of the equation of state and the equation of force balance, we meas...
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ژورنال
عنوان ژورنال: New Journal of Physics
سال: 2011
ISSN: 1367-2630
DOI: 10.1088/1367-2630/13/7/075007