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Abstract : A complete quantum phase shift calculation of several transport coefficients in spin polarized quantum gases 3He, H↑ and D↑ has been carried out for temperatures ranging from 0.04 K to 10 K and nuclear polarizations M varying from 0 to 1. After a detailed analysis of the dynamical features of the collision, the various direct and exchange « cross sections » necessary to describe the collision between two spin-polarized atoms are studied Emphasis is then placed on some particle-indistinguishability consequences that could be seen in 3He or H↑ systems, such as the strong M dependence of the heat capacity, a mode coupling between heat capacity and longitudinal spin diffusion and the oscillatory character of the evolution of the transverse components of M.

Keywords : deuterium electron spin polarisation helium atoms hydrogen neutral atoms quantum fluids specific heat of gases spin dynamics





Author: C. Lhuillier

Source: https://hal.archives-ouvertes.fr/



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