Superfluid vs ferromagnetic behavior in a Bose gas of spin-1/2 atoms

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15 Citations (Scopus)

Abstract

We study the thermodynamic phases of a Bose 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.

Original languageEnglish
Pages (from-to)51-65
Number of pages15
JournalJournal of Low Temperature Physics
Volume140
Issue number1-2
DOIs
Publication statusPublished - 1 Jul 2005

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Keywords

  • Bose-Einstein condensation
  • Ferromagnetism
  • Hartee-fock approximations
  • Superfluidity

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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