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

Research output: Contribution to journalArticle

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
Externally publishedYes

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Hartree approximation
Gases
Phase transitions
Atoms
gases
atoms
condensates
interactions
Thermodynamics
Magnetic fields
Temperature
thermodynamics
magnetic fields
temperature

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Superfluid vs ferromagnetic behavior in a Bose gas of spin-1/2 atoms. / Ashhab, Sahel.

In: Journal of Low Temperature Physics, Vol. 140, No. 1-2, 01.07.2005, p. 51-65.

Research output: Contribution to journalArticle

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