Superfluid vs Ferromagnetic Behaviour in a Bose Gas of Spin-1/2 Atoms

Details Superfluid vs Ferromagnetic Behaviour in a Bose Gas of Spin-1/2 Atoms Superfluid vs Ferromagnetic Behaviour in a Bose Gas of Spin-1/2 Atoms

2004-03-30

arxiv.org/abs/cond-mat/0403720v2

J. Low Temp. Phys. 140, 51 (2005)

Physics

Condensed Matter

Soft Condensed Matter

10 pages, 2 figures

Scientific paper

10.1007/s10909-005-6011-8

We study the thermodynamic phases of a gas of spin-1/2 atoms in the Hartree-Fock approximation. Our main result is that, for repulsive or weakly-attractive inter-component interaction strength, the superfluid and ferromagnetic phase transitions occur at the same temperature. For strongly-attractive inter-component interaction strength, however, the ferromagnetic phase transition occurs at a higher temperature than the superfluid phase transition. We also find that the presence of a condensate acts as an effective magnetic field that polarizes the normal cloud. We finally comment on the validity of the Hartree-Fock approximation in describing different phenomena in this system.

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