Joule-Thomson Coefficient for Strongly Interacting Unitary Fermi Gas

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理论物理通讯 ›› 2010, Vol. 54 ›› Issue (03) : 489-495.

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Joule-Thomson Coefficient for Strongly Interacting Unitary Fermi Gas

LIAO Kai, CHEN Ji-Sheng, and LI Chao

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Abstract

The Joule-Thomson effect reflects the interaction among constituent
particles of macroscopic system. For classical ideal gas, the corresponding Joule-Thomson coefficient is vanishing while it is non-zero for ideal quantum gas due to the quantum degeneracy. In recent years, much attention is paid to the unitary Fermi gas with infinite two-body scattering length. According to universal analysis, the thermodynamical law of unitary Fermi gas is similar to that of non-interacting ideal gas, which can be explored by the virial theorem P=2 E/3V. Based on previous works, we further study the unitary Fermi gas properties. The effective chemical potential is introduced to characterize the nonlinear levels crossing effects in a strongly interacting medium. The changing behavior of the rescaled Joule-Thomson coefficient according to
temperature manifests a quite different behavior from that for ideal Fermi gas.

导出引用

LIAO Kai, CHEN Ji-Sheng, and LI Chao. Joule-Thomson Coefficient for Strongly Interacting Unitary Fermi Gas[J]. 理论物理通讯, 2010, 54(03): 489-495

LIAO Kai, CHEN Ji-Sheng, and LI Chao. Joule-Thomson Coefficient for Strongly Interacting Unitary Fermi Gas[J]. Communications in Theoretical Physics, 2010, 54(03): 489-495

中图分类号： 05.30.Fk 03.75.Hh 21.65.+f