Itinerant ferromagnetism in ultracold Fermi gases

Journal Article · Sun May 15 00:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.83.053635· OSTI ID:21546848

Heiselberg, H ^[1]

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1. Applied Research, DALO, Lautrupbjerg 1-5, DK-2750 Ballerup (Denmark)

Itinerant ferromagnetism in cold Fermi gases with repulsive interactions is studied applying the Jastrow-Slater approximation generalized to finite polarization and temperature. For two components at zero temperature, a second-order transition is found at ak{sub F}{approx_equal}0.90 compatible with results of quantum-Monte-Carlo (QMC) calculations. Thermodynamic functions and observables, such as the compressibility and spin susceptibility and the resulting fluctuations in number and spin, are calculated. For trapped gases, the resulting cloud radii and kinetic energies are calculated and compared to recent experiments. Spin-polarized systems are recommended for effective separation of large ferromagnetic domains. Collective modes are predicted and tricritical points are calculated for multicomponent systems.

• OSTI ID: 21546848
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 83; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANGULAR MOMENTUM
APPROXIMATIONS
CALCULATION METHODS
COMPRESSIBILITY
ENERGY
FERMI GAS
FERROMAGNETISM
FLUCTUATIONS
INTERACTIONS
KINETIC ENERGY
MAGNETISM
MECHANICAL PROPERTIES
MONTE CARLO METHOD
ORIENTATION
PARTICLE PROPERTIES
POLARIZATION
SPIN
SPIN ORIENTATION
THERMODYNAMICS
TRAPPING
VARIATIONS