Superfluid vs Ferromagnetic Behaviour in a Bose Gas of Spin-1/2 Atoms
arXiv:cond-mat/0403720 · doi:10.1007/s10909-005-6011-8
Abstract
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.
10 pages, 2 figures
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- Magnetic and Superfluid Transitions in the d=1 Spin-1 Boson Hubbard Model
- A binary mixture of spinor atomic Bose-Einstein condensates
- Pairing, Ferromagnetism, and Condensation of a normal spin-1 Bose gas
- Magnetic phase transitions of spin-1 ultracold bosons in a cubic optical lattice
- Stoner ferromagnetism in a thermal pseudospin-1/2 Bose gas
- Phase diagram of spin-1/2 bosons in one-dimensional optical lattice
- Three fluid hydrodynamics of spin-1 Bose-Einstein condensates
- Superfluidity and spin superfluidity in spinor Bose gases
- Normal-Superfluid Phase Separation in Spin-Half Bosons at Finite Temperature
- Competition between paramagnetism and diamagnetism in charged Fermi gases
- Simulating systems of itinerant spin-carrying particles using arrays of superconducting qubits and resonators
- Magnetic properties of charged spin-1 Bose gases with ferromagnetic coupling
- Continuous-wave solutions and modulational instability in spinor condensates of positronium
- Reentrance of Bose-Einstein condensation in spinor atomic gases in magnetic field