Viscosity-Entropy Ratio of the Unitary Fermi Gas from Zero-Temperature Elementary Excitations

被引:0
作者
Luca Salasnich
Flavio Toigo
机构
[1] Università di Padova,Dipartimento di Fisica “Galileo Galilei” and CNISM
来源
Journal of Low Temperature Physics | 2011年 / 165卷
关键词
Unitary Fermi gas; Viscosity; Entropy;
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摘要
We investigate the low-temperature behavior of the ratio between the shear viscosity η and the entropy density s in the unitary Fermi gas by using a model based on the zero-temperature spectra of both bosonic collective modes and fermonic single-particle excitations. Our theoretical curve of η/s as a function of the temperature T is in qualitative agreement with the experimental data of trapped ultracold 6Li atomic gases. We find the minimum value η/s≃0.44 (in units of ħ/kB) at the temperature T/TF≃0.27, with TF the Fermi temperature.
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页码:239 / 248
页数:9
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